Answer:
Therefore the rate change of temperature at the point P(2,-1,2) in the direction toward the point (3,-3,3) is [tex]-\frac{5200\sqrt6}{3}e^{-43}[/tex] °C/m.
Step-by-step explanation:
Given that, the temperature at a point (x,y,z) is
[tex]T(x,y,z)=200e^{-x^2-3y^2-9z^2}[/tex].
Rate change of temperature at the point P(2,-1,2) in the direction toward the point Q (3,-3,3) is [tex]D_uT(2,-1,2)[/tex]
[tex]T_x= 200(-2x)e^{-x^2-3y^2-9z^2}[/tex][tex]=-400x200.2xe^{-x^2-3y^2-9z^2}[/tex]
[tex]T_y = 200.(-6y)e^{-x^2-3y^2-9z^2}[/tex][tex]=-1200ye^{-x^2-3y^2-9z^2}[/tex]
[tex]T_z=200(-18z)e^{-x^2-3y^2-9z^2}[/tex][tex]=-3600ze^{-x^2-3y^2-9z^2}[/tex]
The gradient of the temperature
[tex]\bigtriangledown T(x,y,z)= (-400x200.2xe^{-x^2-3y^2-9z^2},-1200ye^{-x^2-3y^2-9z^2},-3600ze^{-x^2-3y^2-9z^2})[/tex] [tex]=-400e^{-x^2-3y^2-9z^2}(x,3y,9z)[/tex]
[tex]\bigtriangledown T(2,-1,2) = -400e^{-2^2-3(-1)^2-9.2^2}(2,3.(-1),9.2)[/tex]
[tex]=-400 e^{-43}(2,-3,18)[/tex]
V=[tex]\overrightarrow {PQ}= \vec{Q}-\vec{P}[/tex]=(3,-3,3)-(2,-1,2)=(1,-2,1)
The unit vector of V is [tex]\frac{(1,-2,1)}{\sqrt{1^2+(-2)^2+1^2}}[/tex]
[tex]=\frac{1}{\sqrt6}(1,-2,1)[/tex]
Therefore,
[tex]D_uT(2,-1,2) = \bigtriangledown T(2,-1,2).\frac{1}{\sqrt6}(1,-2,1)[/tex]
[tex]=-400 e^{-43}(2,-3,18).\frac{1}{\sqrt6}(1,-2,1)[/tex]
[tex]=-\frac{400}{\sqrt6}e^{-43}(2.1+(-3).(-2)+18.1)[/tex]
[tex]=-\frac{10400}{\sqrt6}e^{-43}[/tex]
[tex]=-\frac{5200\sqrt6}{3}e^{-43}[/tex] °C/m
Therefore the rate change of temperature at the point P(2,-1,2) in the direction toward the point (3,-3,3) is [tex]-\frac{5200\sqrt6}{3}e^{-43}[/tex] °C/m.
A magazine provided results from a poll of 1000 adults who were asked to identify their favorite pie. Among the 1000 respondents, 13% chose chocolate pie, and the margin of error was given as plus or minus 4 percentage points. What values do p, q,n,E and p represents? If the confidence level is 90%, what is the value of α.
Answer:
The answer to the given problem is given below.
Step-by-step explanation:
What values do p, q,n,E and p represents?
The value of p is the sample proportion.
The value of q is found from evaluating 1− p.
The value of n is the sample size.
The value of E is the margin of error.
The value of p is the population proportion.
If the confidence level is 90%, what is the value of α?
α = 1- 0.90
α = 0.10
The Giordanos buy $7300 worth of furniture for their new home. They pay $1000 down. The store charged 10% add-on interest. The Giordanos will pay off the furniture in 18 monthly payments(1 1/2 years). Find the monthly payment.
Answer: the monthly payment is $379.1
Step-by-step explanation:
The balance to be paid would be
7300 - 1000 = $6300
We would apply the periodic interest rate formula which is expressed as
P = a/[{(1+r)^n]-1}/{r(1+r)^n}]
Where
P represents the monthly payments.
a represents the amount to be paid
r represents the annual rate.
n represents number of monthly payments. Therefore
a = $6300
r = 0.1/12 = 0.0083
n = 12 × 1.5 = 18
Therefore,
P = 6300/[{(1+0.0083)^18]-1}/{0.0083(1+0.0083)^18}]
6300/[{(1.0083)^18]-1}/{0.0083(1.0083)^36}]
P = 6300/{1.16 -1}/[0.0083(1.16)]
P = 6300/(0.16/0.009628)
P = 6300/16.618
P = $379.1
Final answer:
The Giordanos will have to pay $385 every month for 18 months to fully pay off the furniture with the 10% add-on interest taken into account.
Explanation:
To calculate the monthly payment for the furniture bought by the Giordanos, we'll start by subtracting the down payment from the total cost to find the amount that will be subject to interest. The total cost of the furniture is $7,300 and they paid $1,000 down, leaving $6,300 to be financed.
With a 10% add-on interest, the total interest would be 10% of $6,300, which is $630. Therefore, the total amount to be repaid is the financed amount plus the interest, which is $6,300 + $630 = $6,930.
The Giordanos plan to pay off this amount in 18 monthly payments. Dividing the total amount by 18 gives us the monthly payment.
Monthly Payment Calculation:
Total amount to be repaid: $6,930
Number of monthly payments: 18
Monthly payment: $6,930 ÷ 18 = $385
The Giordanos will have to pay $385 every month for 18 months to fully pay off the furniture.
Consider the population of four juvenile condors. Their weights in pounds are : 4, 5, 7, 12 (a) Let x be the weight of a juvenile condor. Write the possible unique values for x: (NOTE: Separate each value in the list with a comma.) . (b) Find the mean of the population: (c) Let x¯ be the average weight from a sample of two juvenile condors. List all possible outcomes for x¯. (If a value occurs twice, make sure to list it twice.) This is the sampling distribution for samples of size 2: (NOTE: Separate each value in the list with a comma.) . (d) Find the mean of the sampling distribution: Note: You can earn partial credit on this problem.
Answer:
a) 4, 5, 7, 12
b) 7
c) 4.5, 6.5, 8, 6, 8.5, 9.5
d) 7.167
Step-by-step explanation:
We are given the following in the question:
4, 5, 7, 12
a) unique values for x
4, 5, 7, 12
b) mean of the population
[tex]Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}[/tex]
[tex]\mu =\displaystyle\frac{28}{4} = 7[/tex]
c) sampling distribution for samples of size 2
Sample size, n = 2
Possible samples of size 2 are (4,5),(4,7),(4,12),(5,7),(5,12),(7,12)
Sample means are:
[tex]\bar{x_1} = \dfrac{4+5}{2} = 4.5\\\\\bar{x_2} = \dfrac{4+7}{2} = 6.5\\\\\bar{x_3} = \dfrac{4+12}{2} = 8\\\\\bar{x_4} = \dfrac{5+7}{2} = 6\\\\\bar{x_5} = \dfrac{5+12}{2} = 8.5\\\\\bar{x_6} = \dfrac{7+12}{2} = 9.5[/tex]
Thus, the list is 4.5, 6.5, 8, 6, 8.5, 9.5
d) mean of the sampling distribution
[tex]\bar{x} = \dfrac{4.5 + 6.5 + 8+ 6 + 8.5+ 9.5}{6} = \dfrac{43}{6} = 7.167[/tex]
The unique values for x are 4, 5, 7, and 12 pounds. The population mean is 7 pounds, and the sampling distribution for the average weight from a sample of two juvenile condors has possible outcomes of 4.5, 5.5, 6, 8, 8.5, and 9.5 pounds, with a mean of 7 pounds.
Explanation:To answer the student's questions regarding juvenile condor weights:
Possible unique values for x: The unique weights of the juvenile condors are 4, 5, 7, 12 pounds.Mean of the population: The mean (μ) is the average of all the values. To calculate the mean, add all the weights and divide by the number of condors: (4 + 5 + 7 + 12) / 4 = 28 / 4 = 7 pounds.Possible outcomes for ¯x (the average weight from a sample of two juvenile condors): To list all possible outcomes for ¯x, calculate the mean of all possible pairs of condor weights:Since some pairs can be chosen in two ways (e.g., condor 1 and 2, or condor 2 and 1), record the mean for both occurrences. However, in this example, no average is repeated because all condor weights are unique.Mean of the sampling distribution: We can find this by averaging the possible outcomes for ¯x: (4.5 + 5.5 + 8 + 6 + 8.5 + 9.5) / 6 = 42 / 6 = 7 pounds, which is identical to the population mean.
Shari buys a house for $240,000. She makes a down payment of 20% and finances the rest with a 15 year mortgage. She agrees to make equal payments at the end of each month. If the annual interest rate is 1.2% and interest is compounded monthly, what is Shari's regular payment? To solve this question, we use the formula P equals R open parentheses fraction numerator 1 minus (1 plus i )to the power of negative n end exponent over denominator i end fraction close parentheses. Fill in the following blanks for the given information:
Answer:
$1166.08 is the monthly payment for the mortgage per month.
Step-by-step explanation:
The meaning of this stated formula on the statement is the present annuity formula because we will have future monthly payments on the mortgage of the house in which they pay off the present value of the house which is $240000 x 80% = $ 192000 as this amount will excludes the down payment of 20% that is made.
We are given Pv the present value which excludes the down payment $192000.
We have the interest rate i which is 1.2%/12 as it is compounded monthly.
n is the number of payments made over a period which is 12 x 15 years= 180 payments as it is compounded monthly.
no we substitute the above mentioned information to the present value annuity formula stated to calculate R the monthly payment:
Pv = R[(1-(1+i)^-n)/i]
$192000 = R[(1-(1+(1.2%/12))^-180)/ (1.2%/12)] divide both sides by the coefficient of R
$192000/[(1-(1+(1.2%/12))^-180)/(1.2%/12)] = R
$1166.08 =R which this is the amount that will be paid for the mortgage every month for 15 years.
a medical director found mean blood pressure x = 126.07 for an SRS of 72 executives. The standard deviation of the blood pressures of all executives is σ = 15. Give a 90% confidence interval for the mean blood pressure μ of all executives.
Answer:
[tex]126.07-1.64\frac{15}{\sqrt{72}}=123.17[/tex]
[tex]126.07+1.64\frac{15}{\sqrt{72}}=128.97[/tex]
So on this case the 90% confidence interval would be given by (123.17;128.97)
Step-by-step explanation:
Previous concepts
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
[tex]\bar X[/tex] represent the sample mean for the sample
[tex]\mu[/tex] population mean (variable of interest)
s represent the sample standard deviation
n represent the sample size
Solution to the problem
The confidence interval for the mean is given by the following formula:
[tex]\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}[/tex] (1)
Since the Confidence is 0.90 or 90%, the value of [tex]\alpha=0.1[/tex] and [tex]\alpha/2 =0.05[/tex], and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that [tex]z_{\alpha/2}=1.64[/tex]
Now we have everything in order to replace into formula (1):
[tex]126.07-1.64\frac{15}{\sqrt{72}}=123.17[/tex]
[tex]126.07+1.64\frac{15}{\sqrt{72}}=128.97[/tex]
So on this case the 90% confidence interval would be given by (123.17;128.97)
plsss help i don't knwo thai
Question 4: The value of x is 4.5.
Question 5: The value of x is 15.6.
Solution:
Question 4:
The given triangle is a right triangle.
Using trigonometric formulas for a right triangle.
[tex]$\sin \theta=\frac{\text { opposite }}{\text { hypotenuse }}[/tex]
[tex]$\sin C=\frac{AB}{BC}[/tex]
[tex]$\sin 45^\circ=\frac{x}{6.4}[/tex]
[tex]$\frac{1}{\sqrt{2} } =\frac{x}{6.4}[/tex]
Multiply 6.4 on both sides, we get
[tex]$\frac{6.4}{\sqrt{2} }=x[/tex]
x = 4.5
The value of x is 4.5.
Question 5:
The given triangle is a right triangle.
Using trigonometric formulas for a right triangle.
[tex]$\sin \theta=\frac{\text { opposite }}{\text { hypotenuse }}[/tex]
[tex]$\sin E=\frac{EF}{DF}[/tex]
[tex]$\sin 60^\circ=\frac{x}{18}[/tex]
[tex]$\frac{\sqrt3}{2} =\frac{x}{18}[/tex]
Multiply 18 on both sides, we get
x = 15.6
The value of x is 15.6.
The Brutus Gourmet Company produces delicious organic dog treats for canines with discriminating tastes. Management wants the box-filling line to be set so that the process average weight per packet is 127 grams. To make sure that the process is in control, an inspector at the end of the filling line periodically selects a random box of 8 packets and weighs each packet. When the process is in control, the range in the weight of each sample has averaged 10 gramsThe results from the last 5 samples are shown below:Sample Sample Average Sample Range1 124 92 134 83 126 14 127 85 135 7The LCLR = ______________ .
The LCLR is approximately 14.5148.
We have,
To calculate the lower control limit (LCLR) for the range in a control chart, we use the formula:
LCLR = D3 * Average Range
Given the sample ranges of the last 5 samples:
9, 14, 8, 7, and 5, we can calculate the average range:
Average Range = (9 + 14 + 8 + 7 + 5) / 5 = 8.6
The D3 value for a sample size of 8 is typically 1.693.
The lower control limit (LCLR) for the range.
LCLR = D3 * Average Range
= 1.693 * 8.6 = 14.5148
(rounded to four decimal places)
Thus,
The LCLR is approximately 14.5148.
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To find LCLR, calculate the average range of the samples and subtract a constant (d2) from it. In this case, LCLR = 53.977 grams.
Explanation:In this question, we are given the results from the last 5 samples of the weight of packets from the box-filling line. The process average weight per packet is 127 grams. We are asked to find the Lower Control Limit for Range (LCLR) to check if the process is in control. To find LCLR, we need to calculate the average range of the samples and subtract a constant (d2) from it.
First, we calculate the average range of the samples by summing the ranges and dividing by the number of samples. In this case, the sum of the ranges is 92 + 83 + 14 + 85 + 7 = 281. So, the average range is 281 / 5 = 56.2.
Next, we need to find the value of d2, which depends on the sample size. In this case, the sample size is 8. Looking up the value of d2 for a sample sisizeze of 8 in the control chart constants table, we find that it is 2.223. Finally, we can calculate LCLR by subtracting 2.223 from the average range: LCLR = 56.2 - 2.223 = 53.977 grams.
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You flip a coin 4 times that has been weighted such that heads comes up twice as often as tails . What is the probability that all 4 of them are heads?
Answer:
0.1975
Step-by-step explanation:
Let the probability of getting heads on flipping the coin = p
Then the probability of getting tails on flipping the coin = 1-p
It is given that probability of heads is twice the probability of tails.
[tex]\[p= 2* (1-p)\][/tex]
[tex]\[=> p= 2 - 2p\][/tex]
[tex]\[=> 3p= 2 \][/tex]
[tex]\[=> p= \frac{2}{3} \][/tex]
So that probability of getting a head on single coin flip = [tex]\[\frac{2}{3}\][/tex]
This means that the probability of getting heads on 4 coin flips =
[tex]\[ p^{4} \][/tex]
[tex]\[= (\frac{2}{3})^{4} \][/tex]
[tex]\[= 0.1975 \][/tex]
Probability of an event is the measure of its chance of occurrence. The probability of all 4 tossed coins in given context coming out as heads is 0.197 approximately.
How to find that a given condition can be modeled by binomial distribution?Binomial distributions consists of n independent Bernoulli trials.
Bernoulli trials are those trials which end up randomly either on success (with probability p) or on failures( with probability 1- p = q (say))
Suppose we have random variable X pertaining binomial distribution with parameters n and p, then it is written as
[tex]X \sim B(n,p)[/tex]
The probability that out of n trials, there'd be x successes is given by
[tex]P(X =x) = \: ^nC_xp^x(1-p)^{n-x}[/tex]
For the given case, let model the condition as:
Success = getting head on given biased coin
Probability of success = p = 2/3 (as head comes twice as often as tails, so probability of heads = twice probability of q = x say,
then 2x + x = 1(total probability is 1), or x = 1/3 = probability of tails,
thus, probability of heads= 2/3)
Failure = getting tail on given biased coin
Probability of failure = q = 1-p = 1-2/3 = 1/3
All coins' results are independent, thus, they are Bernoulli trials.
The count of Bernoulli trials is n = 4
Let random variable X tracks the number of heads obtained on tossing these 4 given biased coins.
Then,
[tex]X \sim B(4,2/3)[/tex]
The needed probability is
P(X = 4)
Using the probability function of binomial distribution, we get:
[tex]P(X = 4) = \: ^4C_4(2/3)^4(1/3)^0 = \dfrac{16}{81} \approx 0.197[/tex]
Thus, The probability of all 4 tossed coins in given context coming out as heads is 0.197 approximately.
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An airline wants to evaluate the depth perception of its pilots over the age of fifty. A random sample of n = 14 airline pilots over the age of fifty are asked to judge the distance between two markers placed 20 feet apart at the opposite end of the laboratory. The population standard deviation is 1.4. The sample data listed here are the pilots’ error (recorded in feet) in judging the distance.2.9 2.6 2.9 2.6 2.4 1.3 2.3
2.2 2.5 2.3 2.8 2.5 2.7 2.6
Is there evidence that the mean error in depth perception for the company’s pilots over the age of fifty is greater than 2.1? Use α = 0.05 and software to get the results, and paste in the appropriate output.What is the 90% confidence interval for the mean error in depth perception?
Answer:
Step-by-step explanation:
Hello!
1) The objective is to evaluate the depth perception of pilots over the age of fifty.
To do so a sample of n=14 airline pilots over the age of fifty was taken, each of them was asked to judge the distance between two markers placed 20 feet apart, the pilot's error in judging the distance was recorded:
2.9, 2.6, 2.9, 2.6, 2.4, 1.3, 2.3, 2.2, 2.5, 2.3, 2.8, 2.5, 2.7, 2.6
Then the variable of interest is X: error in judging the distance between two markers placed 20 feet apart of one pilot. (feet)
Assuming that this variable has a normal distribution, with a standard deviation of σ= 1.4 feet
The hypothesis is that the mean error in-depth perception for the company's pilots over the age of fifty is greater than 2.1, symbolically: μ > 2.1
H₀: μ ≤ 2.1
H₁: μ > 2.1
α: 0.05
Since the variable has a normal distribution and the population standard deviation is known, the statistic to use for this test is the standard normal:
[tex]Z= \frac{X[bar]-Mu}{\frac{Sigma}{\sqrt{n} } } ~~N(0;1)[/tex]
The sample mean is
X[bar]= ∑X/n= 34.90/14= 2.49
[tex]Z_{H_0}= \frac{2.49-2.1}{\frac{1.4}{\sqrt{14} } } = 1.04[/tex]
The p-value for this test is 0.14917
Using the p-value approach, since it is greater than the significance level, the decision is to not reject the null hypothesis.
Then there is no evidence that the mean error in-depth perception for the company's pilots over the age of fifty is greater than 2.1 feet.
2) To construct the 90% confidence interval you have to use the same distribution as before, the formula for the interval under the standard deviation is:
[X[bar] ± [tex]Z_{1-\alpha /2}[/tex] * (δ/√n)]
[tex]Z_{1-\alpha /2}= Z_{0.95}= 1.645[/tex]
[2.49 ± 1.645 * (1.4/√14)]
[1.87; 3.11]
With a 90% confidence, you'd expect that the true mean of the error in-depth perception of the airline's pilots over fifty years old is contained in the interval [1.87; 3.11].
I hope you have a SUPER day!
The One-Sample T Test can be used to determine whether the mean error in depth perception for pilots over the age of fifty is greater than 2.1. The p-value from this test can inform whether to reject the null hypothesis. The 90% confidence interval can be determined by calculating the standard error and using a t-value associated with a 90% confidence level, the obtained margin of error is subtracted and added to the mean to generate the confidence interval.
Explanation:The subject of the question is statistical testing, specifically One-Sample T Test and Confidence Interval computing. The goal is to determine whether the mean error in depth perception of pilots over the age of fifty is greater than 2.1 and to calculate the 90% confidence interval for the mean error in depth perception.
To perform this test, one would organize the provided data set in a software like R or Excel, compute the sample mean and use the One-Sample T Test function to compare the sample mean to the hypothesized mean of 2.1. The null hypothesis would be that the mean error is not greater than 2.1, and the alternative hypothesis is that the mean error is greater than 2.1. If the p-value received from the One-Sample T Test is less than 0.05, we reject the null hypothesis and conclude that the mean error is greater than 2.1.
As for the 90% Confidence Interval, it is done in statistical software by calculating the standard error, which accounts for both the standard deviation and the sample size, and multiplying it by the relevant t-value (associated with a 90% confidence level and degrees of freedom which equals sample size minus 1). This result then serves as the margin of error which is subtracted and added to the mean to generate the confidence interval.
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The weather during a Bloodhound game is somewhat unpredictable. It may be sunny, cloudy or rainy. The probability of sunny weather is 0.42. The probability of cloudy weather is 0.38. The probability of rainy weather is .20. John Jay, mighty center-fielder for the Bloodhounds, is colorblind. Thus, if it is sunny, he has a 0.19 probability of hitting a home run in a game; if it cloudy, he has a 0.12 probability of hitting a home run in a game; if it is rainy, he has a 0.17 probability of hitting a home run in a game. The Bloodhounds play a game, say G.
a. What is the probability that John Jay hits a home run in G
b. What is the probability that John Jay does not hit a home run in G?
c. Find the conditional probability that John Jay hits a home run in G given that it rains?
d. What is the probability that it rains, and John Jay hits a home run?
e. If John Jay hits a home run, what is the probability that it rained?
f. If weather is independent from day to day then what is the probability that it is sunny 3 days in a row.
Answer: a. 0.159
b. 0.841
C. 0.17
d. 0.034
e. 0.2133
F. 0.501
Step-by-step explanation:
On average, it takes Han Solo 45 seconds to check the coordinates and make the jump into hyperspace. The standard deviation on this important task is 5 seconds. When Han and Chewbacca and their passengers are leaving for Alderaan they make the jump in 33 seconds or less. What is the probability of such an accomplishment?
Answer:
0.0082 or 0.82%
Step-by-step explanation:
Given:
Mean of jump time (μ) = 45 s
Standard deviation (σ) = 5 s
Time for jump required for accomplishment (x) = 33 s
The distribution is normal distribution.
So, first, we will find the z-score of the distribution using the formula:
[tex]z=\frac{x-\mu}{\sigma}[/tex]
Plug in the values and solve for 'z'. This gives,
[tex]z=\frac{33-45}{5}=-2.4[/tex]
So, the z-score of the distribution is -2.4.
Now, we need the probability [tex]P(x\leq 33)=P(z\leq -2.4)[/tex].
From the normal distribution table for z-score equal to -2.4, the value of the probability is 0.0082 or 0.82%.
Therefore, the probability of making a jump in 33 seconds or less is 0.0082 or 0.82%.
Using the normal distribution, it is found that there is a 0.0082 = 0.82% probability of such an accomplishment.
In a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
It measures how many standard deviations the measure is from the mean. After finding the z-score, we look at the z-score table and find the p-value associated with this z-score, which is the percentile of X.In this problem:
Mean of 45 seconds, hence [tex]\mu = 45[/tex].Standard deviation of 5 seconds, hence [tex]\sigma = 5[/tex].The probability is the p-value of Z when X = 33, hence:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{33 - 45}{5}[/tex]
[tex]Z = -2.4[/tex]
[tex]Z = -2.4[/tex] has a p-value of 0.0082.
0.0082 = 0.82% probability of such an accomplishment.
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Velvetleaf is a particularly annoying weed in cornfields. It produces lots of seeds, and the seeds wait in the soil for years until conditions are right. How many seeds do velvetleaf plants produce? (Use 96% confidence). Here are counts from 28 plants that came up in a cornfield when no herbicide was used:
2450 2504 2114 1110 2137 8015 1623 1531 2008 1716721 863 1136 2819 1911 2101 1051 218 1711 1642228 363 5973 1050 1961 1809 130 880
Answer:
96% CI for the production of seeds
[tex]1177.5\leq\mu\leq2520.5[/tex]
Step-by-step explanation:
We have a sample of size n=28. With these data we can calculate the mean and standard deviation of the sample.
Sample = [2450, 2504, 2114, 1110, 2137, 8015, 1623, 1531, 2008, 1716, 721, 863, 1136, 2819, 1911, 2101, 1051, 218, 1711, 1642, 228, 363, 5973, 1050, 1961, 1809, 130, 880 ]
Sample mean = 1849
Sample standard deviation = 1647
To calculate a 96% confidence interval, we use the t-statistic with df=27.
The t-value for this condition is t=2.1578.
[tex]M\pm t_{27}*s/\sqrt{n}\\\\1849\pm2.1578*1647/\sqrt{28}\\\\1849\pm671.5\\\\\\1849-671.5\leq\mu\leq 1849+671.5\\\\\\1177.5\leq\mu\leq2520.5[/tex]
Then, the 96% interval is
[tex]1177.5\leq\mu\leq2520.5[/tex]
The 96% interval is [117.5,2520.5] and this can be determined by using the t-statistics and the given data.
Given :
Sample Size = 28Sample = [2450, 2504, 2114, 1110, 2137, 8015, 1623, 1531, 2008, 1716, 721, 863, 1136, 2819, 1911, 2101, 1051, 218, 1711, 1642, 228, 363, 5973, 1050, 1961, 1809, 130, 880]The sample mean for this is 1849 and the standard deviation is 1647.
Use t-statistic with df = 27 to calculate 96% confidence interval. So, the t-value is 2.1578.
[tex]\rm M\pm t_{27}\times \dfrac{s}{\sqrt{n} }[/tex]
[tex]1849\pm 2.1578 \times \dfrac{1647}{\sqrt{28} }[/tex]
[tex]1849\pm 671.5[/tex]
[tex]1849-671.5\leq \mu \leq 1849+671.5[/tex]
[tex]117.5\leq \mu \leq 2520.5[/tex]
Therefore, the 96% interval is [117.5,2520.5].
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If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: minus2.00, minus1.00, 0, 1.00, 2.00? Why?
Answer:
You would prefer a z-score of 2, because the higher the z-score, the higher your grade was relative to your classmates.
Step-by-step explanation:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
For example
If the z-score of your grade was -2, it means that your grade was 2 standard deviations below the average grade.
Otherwise, if the z-score of your grade was 2, it means that your grade was 2 standard deviations above the average higher.
The higher the z-score, the better.
So you would prefer a z-score of 2, because the higher the z-score, the higher your grade was relative to your classmates.
An oil exploration company currently has two active proj- ects, one in Asia and the other in Europe. Let A be the event that the Asian project is successful and B be the event that the European project is successful. Suppose that A and B are independent events with and . a. If the Asian project is not successful, what is the proba- bility that the European project is also not successful? Explain your reasoning. b. What is the probability that at least one of the two proj- ects will be successful? c. Given that at least one of the two projects is successful, what is the probability that only the Asian project is successful? P(A) 5 .4 P(B) 5 .7
Answer:
a) P(B'|A') = P(B') = 1 - 0.7 = 0.3.
The reasoning is that: since, events A and B are independent, then, events A' and B' are also independent and for independent events, P(A|B) = P(A).
b) P(A u B) = 0.82
c) P[(A n B')|(A u B)] = 0.146
Step-by-step explanation:
P(A) = 0.4
P(B) = 0.7
A and B are independent events.
P(A') = 1 - 0.4 = 0.6
P(B') = 1 - 0.7 = 0.3
a) If the Asian project is not successful, what is the proba- bility that the European project is also not successful?
P(B'|A') = P(B') = 1 - 0.7 = 0.3
The reasoning is that: since, events A and B are independent, then, events A' and B' are also independent and for independent events, P(A|B) = P(A).
b) The probability that at least one of the two projects will be successful = P(A u B)
P(A u B) = P(A) + P(B) - P(A n B) = 0.4 + 0.7 - (0.4)(0.7) = 0.82
OR
P(A u B) = P(A n B') + P(A' n B) + P(A n B) = (0.4)(0.3) + (0.6)(0.7) + (0.4)(0.7) = 0.82
c) Given that at least one of the two projects is successful, what is the probability that only the Asian project is successful?
P[(A n B')|(A u B)] = }P(A n B') n P(A u B)]/P(A u B) = P(A n B')/P(A u B) = (0.4)(0.3)/(0.82)
P[(A n B')|(A u B)] = 0.146
Hope this Helps!!!
A random sample of 11 statistics students produced data where x is the third exam score out of 80, and y is the final exam score out of 2 The score on the final exam will likely be lower by about 174 points. b. For each 4.83 point increase in the third exam score, we expect the final exam score t
Answer:
b.
About 44% of the variation in the final exam score can be explained by the students' scores on the 3rd exam. The remaining 56% is due to other factors or unexplained randomness.
Step-by-step explanation:
Hello!
X: Third exam score of a statistics student.
Y: Final exam score of a statistics student.
The estimated regression line is: y = -173.51 + 4.83x
Where
-173.51 is the estimation of the intercept and you can interpret it as the value of the estimated average final exam score when the students scored 0 points on their third exam.
4.83 is the estimation of the slope and you can interpret is as the modification on the estimated average score of the final exam every time the score on the third exam increases 1 point.
R²= represents the coefficient of determination.
Its interpretation is: 44% of the variability of the final exam scores of the statistics students are explained by the scores in the third exam, under the estimated model y = -173.51 + 4.83x.
I hope it helps!
-*-
A random sample of 11 statistics students produced data where x is the third exam score out of 80, and y is the final exam score out of 200. The corresponding regression line has the equation: y = -173.51 + 4.83x, and the value of r2 (the "coefficient of determination") is found to be 0.44. What is the proper interpretation of r2?
a.
Due to the number of points on the two exams, the third exam score will likely be 44% of the final exam score.
b.
About 44% of the variation in the final exam score can be explained by the students' scores on the 3rd exam. The remaining 56% is due to other factors or unexplained randomness.
c.
For each 1 point increase in the 3rd exam score, we expect the final exam score to increase by 0.44 points.
d.
For each 1 point increase in the 3rd exam score, we expect the final exam score to increase by 0.44 percent.
e.
44% of the students scored within 1 standard deviation of the mean on each of the two tests.
The r² value of 0.44 indicates that approximately 44% of the variation in final exam scores can be explained by scores on the third exam, with the remaining variation due to other factors. Option b is the correct interpretation.
The coefficient of determination, denoted as r², explains the proportion of the variance in the dependent variable (y) that is predictable from the independent variable (x).
X is statistic exam score.Y is statistics final exam score.Estimated regression line: y = -173.51 + 4.83xIn this context, the r² value is 0.44, which means that approximately 44% of the variation in the final exam scores (y) can be explained by the variation in the third exam scores (x).
So, the correct interpretation of r² is given by option b: "About 44% of the variation in the final exam score can be explained by the students' scores on the 3rd exam. The remaining 56% is due to other factors or unexplained randomness."
Complete Question:
A random sample of 11 statistics students produced data where x is the third exam score out of 80, and y is the final exam score out of 200. The corresponding regression line has the equation: y = -173.51 + 4.83x, and the value of r2 (the "coefficient of determination") is found to be 0.44. What is the proper interpretation of r2?
a. Due to the number of points on the two exams, the third exam score will likely be 44% of the final exam score.
b. About 44% of the variation in the final exam score can be explained by the students' scores on the 3rd exam. The remaining 56% is due to other factors or unexplained randomness.
c. For each 1 point increase in the 3rd exam score, we expect the final exam score to increase by 0.44 points.
d. For each 1 point increase in the 3rd exam score, we expect the final exam score to increase by 0.44 percent.
e. 44% of the students scored within 1 standard deviation of the mean on each of the two tests.
An experimenter has conducted a single‐factor experiment with four levels of the factor, and each factor level has been replicated six times. The computed value of the F F ‐statistic is F 0 = 3.26 F 0 = 3.26 . Find bounds on the P P ‐value.
Answer:
Step-by-step explanation:
You can find your answer in attached document.
Final answer:
the null hypothesis is retained and the P-value for this result is greater than 0.05, constituting a lower bound on the P-value.
Explanation:
The experiment involves a single-factor ANOVA with four levels of the factor and six replications per level. The computed value of the F-statistic is F0 = 3.26. Based on the provided information, the critical value for a significance level of α = 0.05 with 3 and 18 degrees of freedom (four levels minus one for the numerator and 24 minus four for the denominator) is 9.197. Since the obtained F0 is less than the critical value, the null hypothesis is retained. Therefore, there is no evidence to suggest a significant difference in variances at the 0.05 level.
To find bounds on the P-value, we look at standard F-distribution tables or use software to find the exact probability. However, since F0 < F(0.05, 3, 18), we know that the P-value must be greater than 0.05, giving us a lower bound. An upper bound is more challenging to state without additional tables or software but is less than 1.0 as a P-value cannot exceed this.
Let X represent the time it takes from when someone enters the line for a roller coaster until they exit on the other side. Consider the probability model defined by the cumulative distribution function given below.
0 x < 3
F(x) = (x-3)/1.13 3 < x < 4.13
1 x > 4.13
A. What is E(X)? Give your answer to three decimal places.
B. What is the value c such that P(X < c) = 0.75? Give your answer to four decimal places.
C. What is the probability that X falls within 0.28 minutes of its mean? Give your answer to four decimal places.
Answer:
a) E(x)=3.565
b) c=3.8475 --> P(X < 3.8475) = 0.75
c) The probability that X falls above or below 0.28 min from the mean is P=0.4954.
Step-by-step explanation:
We have the cumulative distribution function as information.
a) To calculate the expected value, we can calculate the value of x in which F(x) equals 0.5. This happens for x=3.565.
[tex]F(x)=\frac{x-3}{1.13} =0.5\\\\x-3=0.5*1.13=0.565\\\\x=0.565+3=3.565[/tex]
b) What is the value c such that P(X < c) = 0.75?
In this case, we have to calculate x to have F(x)=0.75
[tex]F(x)=\frac{x-3}{1.13} =0.75\\\\x-3=0.75*1.13=0.8475\\\\x=0.8475+3=3.8475[/tex]
This happens for x=3.8475.
c) We have to calculate the probability that X falls above or below 0.28 min from the mean (x=3.565).
This is the probability that the time is between 3.285 and 3.845
[tex]x_1=3.565-0.28=3.285\\\\x_2=3.565+0.28=3.845[/tex]
We can calculate this as:
[tex]P(3.285<x<3.845)=F(3.845)-F(3.285)\\\\F(3.845)=\frac{3.845-3}{1.13}=\frac{0.845}{1.13}= 0.7478\\\\F(3.285)=\frac{3.285-3}{1.13}=\frac{0.285}{1.13}= 0.2522\\\\\\P(3.285<x<3.845)=F(3.845)-F(3.285)=0.7478-0.2522=0.4956\\\\[/tex]
The probability that X falls above or below 0.28 min from the mean is P=0.4954.
Events A1, A2 and A3 form a partiton of the sample space S with probabilities P(A1) = 0.3, P(A2) = 0.5, P(A3) = 0.2.
If E is an event in S with P(E|A1) = 0.1, P(E|A2) = 0.6, P(E|A3) = 0.8, compute
P(E) =
P(A1|E) =
P(A2|E) =
P(A3|E) =
Answer:
Step-by-step explanation:
Given that events A1, A2 and A3 form a partiton of the sample space S with probabilities P(A1) = 0.3, P(A2) = 0.5, P(A3) = 0.2.
i.e. A1, A2, and A3 are mutually exclusive and exhaustive
E is an event such that
P(E|A1) = 0.1, P(E|A2) = 0.6, P(E|A3) = 0.8,
[tex]P(E) = P(A_1E)+P(A_2E)+P(A_3E)\\= \Sigma P(E/A_1) P(A_1) \\= 0.1(0.3)+0.5(0.6)+0.8(0.2)\\= 0.03+0.3+0.16\\= 0.49[/tex]
[tex]P(A_1/E) = P(A_1E)/P(E) = \frac{0.3(0.1)}{0.49} \\=0.061224[/tex]
[tex]P(A_2/E) = P(A_2E)/P(E) = \frac{0.5)(0.6)}{0.49} \\=0.61224[/tex]
[tex]P(A_3/E) = P(A_3E)/P(E) = \frac{0.2)(0.8)}{0.49} \\=0.3265[/tex]
The probability of event E is 0.49. The probability of event A1 given E is approximately 0.0612. The probability of event A2 given E is approximately 0.6122. The probability of event A3 given E is approximately 0.3265.
Explanation:Probability of event E:
P(E) = P(E|A1) * P(A1) + P(E|A2) * P(A2) + P(E|A3) * P(A3)
P(E) = 0.1 * 0.3 + 0.6 * 0.5 + 0.8 * 0.2 = 0.03 + 0.3 + 0.16 = 0.49
Probability of event A1 given E:
P(A1|E) = [P(E|A1) * P(A1)] / P(E) = (0.1 * 0.3) / 0.49 = 0.03 / 0.49 ≈ 0.0612
Probability of event A2 given E:
P(A2|E) = [P(E|A2) * P(A2)] / P(E) = (0.6 * 0.5) / 0.49 = 0.3 / 0.49 ≈ 0.6122
Probability of event A3 given E:
P(A3|E) = [P(E|A3) * P(A3)] / P(E) = (0.8 * 0.2) / 0.49 = 0.16 / 0.49 ≈ 0.3265
(a) Use Euler's method with step size 0.2 to estimate y(1.4), where y(x) is the solution of the initial-value problem y' = 4x − 4xy, y(1) = 0. (Round your answer to four decimal places.) y(1.4) =
Answer:
[tex]y\left(1.4\right)=0.992[/tex].
Step-by-step explanation:
The Euler's method states that [tex]y_{n+1}=y_n+h \cdot f \left(x_n, y_n \right)[/tex], where [tex]x_{n+1}=x_n + h[/tex].
To find [tex]y\left(1.4 \right)[/tex] for [tex]y'=- 4 x y + 4 x[/tex] when [tex]y\left(1 \right)=0[/tex], with step size [tex]h=0.2[/tex] using the Euler's method you must:
We have that [tex]h=0.2=\frac{1}{5}[/tex], [tex]x_0=1[/tex], [tex]y_0=0[/tex], [tex]f(x,y)=- 4 x y + 4 x[/tex].
Step 1.
[tex]x_{1}=x_{0}+h=1+\frac{1}{5}=\frac{6}{5}[/tex]
[tex]y\left(x_{1}\right)=y\left( \frac{6}{5} \right)=y_{1}=y_{0}+h \cdot f \left(x_{0}, y_{0} \right)=0+h \cdot f \left(1, 0 \right)=0 + \frac{1}{5} \cdot \left(4.0 \right)=0.8[/tex]
Step 2.
[tex]x_{2}=x_{1}+h=\frac{6}{5}+\frac{1}{5}=\frac{7}{5}=1.4[/tex]
[tex]y\left(x_{2}\right)=y\left( \frac{7}{5} \right)=y_{2}=y_{1}+h \cdot f \left(x_{1}, y_{1} \right)=0.8+h \cdot f \left(\frac{6}{5}, 0.8 \right)=0.8 + \frac{1}{5} \cdot \left(0.96 \right)=0.992[/tex]
The answer is [tex]y\left(1.4\right)=0.992[/tex]
A fishing company operates a search plane to find schools of fish in the ocean. Schools of fish are randomly located in the ocean. On average, there is one school of fish per 100,000 square miles of ocean. During any one day, the plane can search 10,000 square miles.
COMPLETE QUESTION:
What is the expected number of schools of fish found in one day of searching?
Answer: 0.1
Step-by-step explanation:
One school of fish per 100,000 square miles of ocean
Plane can search 10,000 square miles
Therefore,
Expected number of schools of fish found in one day of searching
= 10,000 / 100,000
= 0.1
Set up iterated integrals for both orders of integration. Then evaluate the double integral using the easier order. y dA, D is bounded by y = x − 42; x = y2 D
To set up the iterated integrals for a given region, we need to find the limits of integration for both x and y. In this case, the region D is bounded by y = x - 42 and x = y^2. By visualizing the region, we can determine the limits of integration for both orders of integration. We can then choose the easier order to evaluate the double integral.
Explanation:To set up the iterated integrals, we need to find the limits of integration for both x and y. First, let's visualize the region D bounded by y = x - 42 and x = y^2. The curve y = x - 42 intersects the parabola x = y^2 at two points: (7, -35) and (-7, -49).
To set up the iterated integral with dx dy order, the outer integral will have limits of integration for y that go from -49 to -35. The inner integral will have limits of integration for x that go from the parabola x = y^2 to the line x = y + 42.
The iterated integral with dy dx order can be set up by reversing the order of integration. The outer integral will have limits of integration for x that go from -7 to 7, and the inner integral will have limits of integration for y that go from the line y = x - 42 to the parabola y = sqrt(x).
To evaluate the double integral using the easier order, we can choose either order and find the corresponding iterated integral.
Let's choose the dy dx order. The limits of integration for the outer integral are x = -7 to x = 7, and for each x, the limits of integration for the inner integral are y = x - 42 to y = sqrt(x).
Now, we can evaluate the double integral.
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You bike
5
miles the first day of your training,
5.4 miles the second day,
6.2 miles the third day, and
7.8 miles the fourth day. If you continue this pattern, how many miles do you bike the seventh day?
You will bike 30.2 miles in the seventh day according to the prediction.
Explanation:Here we have the following data, You bike
5 miles the first day of your training, 5.4 miles the second day, 6.2 miles the third day, and 7.8 miles the fourth day.So we can know some facts:
From the first day to the second day the number of miles increases:[tex]5.4-5=0.4mi[/tex]
From the second day to the third day the number of miles increases:[tex]6.2-5.4=0.8mi[/tex]
From the third day to the fourth day the number of miles increases:[tex]7.8-6.2=1.6mi[/tex]
By taking a look at the pattern, we can see that each day you increases the number of miles by a factor of 2 compared to the previous day. So:
From the fourth day to the fifth day the number of miles increases:[tex]x_{5}-7.8=3.2mi \\ \\ x_{5}=7.8+3.2=11mi, \ \text{Day 5}[/tex]
From the fifth day to the sixth day the number of miles increases:[tex]x_{6}-11=6.4mi \\ \\ x_{6}=6.4+11=17.4mi, \ \text{Day 6}[/tex]
Finally:
From the sixth day to the seventh day the number of miles increases:[tex]x_{7}-17.4=12.8mi \\ \\ x_{7}=12.8+17.4=30.2mi, \ \text{Day 7}[/tex]
By noting the pattern that the daily increase doubles each time, we can predict that the total distance biked on the seventh day would be 30.2 miles.
Explanation:To predict the number of miles biked on the seventh day, we need to first determine the pattern in the increase of biking distances over the days given. The distances biked in the consecutive days are: 5, 5.4, 6.2, and 7.8 miles. We can see that each day, the distance increases at varying amounts:
From day 1 to 2: 5.4 - 5 = 0.4 milesFrom day 2 to 3: 6.2 - 5.4 = 0.8 milesFrom day 3 to 4: 7.8 - 6.2 = 1.6 milesThe increase pattern appears to be that each day the distance increases by double the amount of the previous day. Therefore, we can predict the increase and the total distance for the next days:
From day 4 to 5: 1.6 * 2 = 3.2 miles increase, Total = 7.8 + 3.2 = 11 milesFrom day 5 to 6: 3.2 * 2 = 6.4 miles increase, Total = 11 + 6.4 = 17.4 milesFrom day 6 to 7: 6.4 * 2 = 12.8 miles increase, Total = 17.4 + 12.8 = 30.2 milesIf the pattern continues, the student would bike 30.2 miles on the seventh day.
Two fair dice are tossed, and the up face on each die is recorded. Find the probability of observing each of the following events: A:{ The sum of the numbers is odd } B:{ The sum of the numbers is 10 or more } C:{ A 3 appears on each of the two dice }
The probability of event A is 1/2, the probability of event B is 5/18, and the probability of event C is 1/36.
Explanation:To find the probability of each event, we need to analyze the possible outcomes and count the favorable outcomes for each event.
a) Event A: The sum of the numbers is odd.
Out of the 36 possible outcomes (6 outcomes for the first die and 6 outcomes for the second die), 18 outcomes have an odd sum. Therefore, the probability of event A is 18/36 = 1/2.
b) Event B: The sum of the numbers is 10 or more.
Out of the 36 possible outcomes, 10 outcomes have a sum of 10 or more. Therefore, the probability of event B is 10/36 = 5/18.
c) Event C: A 3 appears on each of the two dice.
Out of the 36 possible outcomes, only 1 outcome has a 3 on each die. Therefore, the probability of event C is 1/36.
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A. The probability that the sum of the numbers is odd is [tex]\(\frac{1}{2}\)[/tex].
B. The probability that the sum of the numbers is 10 or more is [tex]\(\frac{1}{6}\)[/tex].
C. The probability that a 3 appears on each of the two dice is [tex]\(\frac{1}{36}\)[/tex].
First, note that each die has 6 faces, so the total number of possible outcomes when two dice are tossed is:
[tex]\[ 6 \times 6 = 36 \][/tex]
A. The sum of two numbers is odd if one number is even and the other is odd.
- Dice faces: {1, 2, 3, 4, 5, 6}
- Odd faces: {1, 3, 5}
- Even faces: {2, 4, 6}
For each of the 3 odd faces on the first die, the second die can show any of the 3 even faces. Similarly, for each of the 3 even faces on the first die, the second die can show any of the 3 odd faces.
So, the number of favorable outcomes:
[tex]\[ 3 \times 3 + 3 \times 3 = 9 + 9 = 18 \][/tex]
The probability of event A is
[tex]\[ \frac{18}{36} = \frac{1}{2} \][/tex]
B. Let's list the pairs of dice faces whose sums are 10 or more:
- Sum = 10: (4, 6), (5, 5), (6, 4)
- Sum = 11: (5, 6), (6, 5)
- Sum = 12: (6, 6)
Number of favorable outcomes:
[tex]\[ 3 + 2 + 1 = 6 \][/tex]
The probability of event B is
[tex]\[ \frac{6}{36} = \frac{1}{6} \][/tex]
C. This event means both dice show 3:
- Outcome: (3, 3)
Number of favorable outcomes: 1
The probability of event C is [tex]\[ \frac{1}{36} \][/tex]
The time it takes to manufacture a product is modeled by a continuous distribution. The time to manufacture one unit can take anywhere from 5 to 6 minutes with equal probability. What distribution can be used to model the random variable, production time
Answer:
The distribution of the time it takes to manufacture the products can be explained by the continuous Uniform distribution.
Step-by-step explanation:
An Uniform distribution is the probability distribution of outcomes that are equally likely, i.e. all the outcomes has the same probability of occurrence.
Uniform distribution are discrete and continuous.
A discrete uniform distribution describes the probability distribution of discrete random variable that assumes discrete values. For example, roll of a die.
A continuous uniform distribution describes probability distribution of continuous random variable that assumes values in a specified interval. For example, time it takes to reach school from home.
In this case let the random variable X be defined as the time it takes to manufacture a product.
To manufacture 1 unit the time taken is between 5 to 6 minutes.
Every value in the interval 5 - 6 has equal probability.
The distribution of the time it takes to manufacture the products can be explained by the continuous Uniform distribution.
The probability density function of a continuous Uniform distribution is:
[tex]f(x)=\left \{ {{\frac{1}{b-a};\ x\ \epsilon\ [a, b]} \atop {0;\ otherwise}} \right.[/tex]
If the pH level of the reservoir is ok, the results at each location will have varying results, with an average pH of 8.5 and a standard deviation of 0.22. If the pH level of the reservoir is ok, what is the probability that the sample average is LESS than 8.47
Final answer:
The probability of the sample average pH being less than 8.47, given a mean of 8.5 and a standard deviation of 0.22, is approximately 44.55%, as calculated using the Z-score and the standard normal distribution.
Explanation:
To determine the probability that the sample average pH is less than 8.47, when the average pH of the reservoir is 8.5 and the standard deviation is 0.22, we can use the concepts of the normal distribution and Z-scores in statistics. A Z-score is a measure of how many standard deviations an element is from the mean. First, we calculate the Z-score for pH 8.47 using the formula:
Z = (X - μ) / σ
Where X is the value of interest (8.47), μ is the mean pH (8.5), and σ is the standard deviation (0.22). Plugging in the numbers:
Z = (8.47 - 8.5) / 0.22 = -0.03 / 0.22 ≈ -0.1364
With a Z-score of approximately -0.1364, we can then consult the standard normal distribution table to find the probability corresponding to this Z-score. The probability associated with a Z-score of -0.1364 is about 0.4455, meaning there is a 44.55% chance that a sample average pH would be less than 8.47, assuming the pH levels are normally distributed.
The number of cars sold weekly by a new automobile dealership grows according to a linear growth model. The first week the dealership sold six cars ( P 0 = 6 ). The second week the dealership sold eight cars ( P 1 = 8 ). Write the recursive formula for the number of cars sold, P n , in the ( n + 1 )th week. P n = P n − 1 + Write the explicit formula for the number of cars sold, P n , in the ( n + 1 )th week. P n = If this trend continues, how many cars will be sold in the fourth week?
(a) Recursive formula for the number of cars sold, [tex]P_n[/tex], in the (n + 1)th week: [tex]P_n = P_{n-1} + 2[/tex]
(b) Explicit formula for the number of cars sold, [tex]P_n[/tex], in the (n + 1)th week:
[tex]P_n = 6 + 2n[/tex]
(c) In the fourth week, the dealership will sell 12 cars.
To find the recursive formula for the number of cars sold, [tex]P_n[/tex], in the (n + 1)th week, we can observe the pattern from the given information.
Given data:
[tex]P_0 = 6[/tex] (number of cars sold in the first week)
[tex]P_1 = 8[/tex] (number of cars sold in the second week)
We can see that each week, the number of cars sold increases by 2. So, the recursive formula can be expressed as:
[tex]P_n = P_{n-1} + 2[/tex]
This formula states that the number of cars sold in the nth week [tex](P_n)[/tex] is equal to the number of cars sold in the previous week [tex](P_{n-1})[/tex] plus 2.
Next, let's find the explicit formula for the number of cars sold, [tex]P_n[/tex], in the (n + 1)th week.
To do this, we need to identify the initial value ([tex]P_0[/tex]) and the common difference (d) in the arithmetic sequence. In this case, the initial value is 6 (P₀ = 6), and the common difference is 2 (the number of cars sold increases by 2 each week).
The explicit formula for an arithmetic sequence is given by:
[tex]P_n = P_0 + n * d[/tex]
Substitute the given values:
[tex]P_n = 6 + n * 2[/tex]
Therefore, the explicit formula for the number of cars sold, P_n, in the (n + 1)th week is [tex]P_n = 6 + 2n[/tex].
Now, let's find how many cars will be sold in the fourth week (n = 3):
[tex]P_3 = 6 + 2 * 3[/tex]
[tex]P_3 = 12[/tex]
In the fourth week, the dealership will sell 12 cars.
Learn more about arithmetic sequence here:
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The recursive formula for the number of cars sold weekly is Pn = Pn - 1 + 2, where Pn represents the number of cars in the nth week. The explicit formula is Pn = 6 + 2n. Based on this model, the dealership would sell 14 cars in the fourth week.
Explanation:In your problem, the number of cars sold each week is increasing by a constant amount, following a linear growth model. The first week, 6 cars were sold and the second week, 8 cars were sold. This indicates an increase of 2 cars from week 1 to week 2.
To write the recursive formula for the number of cars sold, Pn, in the (n + 1)th week, we determine the growth by subtraction: P1 - P0 = 8 - 6 = 2. So, every week, the number of cars sold increases by 2. The recursive formula would therefore be Pn = Pn - 1 + 2.
For the explicit formula which gives us the number of cars sold in the n-th week directly, we observe that it started with 6 cars (base) and increments by 2 each week. Therefore, the explicit formula would be Pn = 6 + 2n.
By the fourth week, the number of cars sold would be P4 = 6 + 2 * 4 = 6 + 8 = 14 cars sold.
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If all other factors are held constant, increasing the sample size will do the following.
decrease the width of the confidence interval
increase the standard error
None of the other choices are correct.
increase the width of the confidence interval
Answer:
Decrease the width of the confidence interval
Step-by-step explanation:
Sample size is in the denominator, so increasing n would decrease the width for the same level of confidence
Final answer:
Increasing the sample size will decrease the width of the confidence interval and decrease the standard error, leading to a more precise estimate of the population mean with the same level of confidence.
Explanation:
If all other factors are held constant, increasing the sample size will decrease the width of the confidence interval. This is because a larger sample size reduces the variability within the sample. The standard error, which is inversely proportional to the square root of the sample size, will also decrease as a result. Thus, we do not need as wide an interval to capture the true population mean with the same level of confidence when the sample size is larger.
Another related concept is that as the confidence level increases, the error bound increases, making the confidence interval wider. However, this effect is separate from changes in the sample size. Also, it's important to note that the standard deviation of the sampling distribution of the means will decrease as the sample size increases, leading to a more precise estimate of the population mean. Therefore, increasing the sample size, while keeping the confidence level constant, leaves us more confident about our estimate being closer to the true population mean.
[10 points] Let v1, v2 and v3 be three linearly independent vectors in R 3 . (a) Find the rank of the matrix A = (v1 − v2) (v2 − v3) (v3 − v1) . (b) Find the rank of the matrix B = (v1 + v2) (v2 + v3) (v3 + v1) .
Answer:
The solution and complete explanation for the above question and mentioned conditions is given below in the attached document.I hope my explanation will help you in understanding this particular question.
Step-by-step explanation:
A mechanical assembly consists of a rod with a bearing on each end. The three parts are manufactured independently, and all vary a bit from part to part. The length of the rod has mean 23 centimeters (cm) and standard deviation 0.18 millimeters (mm). The length of a bearing has mean 2 cm and standard deviation 0.03 mm. What are the mean and standard deviation of the total length of the assembly? (Round your standard deviation answer to four decimal places.)
Answer:
Total mean= 27cm
Total standard deviation = 0.1849mm
Step-by-step explanation:
The mechanical assembly has three parts consisting of the length of the rod (the this be called x), the length of the bearing (be called y). You might be wondering where the third part is but the assembly usually has two bearings. Then the second length of the bearing (be called z).
From the problem,
μx = 23, μy =2, μz = 2
σx = 0.18, σy = 0.03, σz = 0.03
We can find the total Mean by adding all the means,
μxyz = 23 + 2 + 2 = 27cm
Since the length of the assembly are independent,
To find the total standard deviation, we must first find the total variance(square of standard deviation)
σ² = (0.18)² + (0.03)² + (0.03)² = 0.0342
Now, we find the standard deviation (square root of the variance)
σ = √0.0342 = 0.18493242
σ ≈ 0.1849mm (you can change to cm by multiplying by 10)
The mean total length of the mechanical assembly is 27 cm and the standard deviation is approximately 0.0183 cm when rounded to four decimal places.
Explanation:The question is asking for the mean and standard deviation of the total length of a mechanical assembly with a rod and two bearings. To find the mean total length, we simply add the mean lengths of the rod and two bearings.
The mean length of the rod is 23 cm and of each bearing is 2 cm, which sums up to a mean total length of 27 cm for the assembly since there are two bearings (23 + 2 + 2).
For standard deviation, since the parts are manufactured independently, we apply the rule of variances: The variance of the sum of independent variables is the sum of their variances. The standard deviation of the rod is 0.18 mm (or 0.018 cm), and of each bearing is 0.03 mm (or 0.003 cm).
Thus, the total variance for the assembly is the sum of the variances: (0.0182 + 0.0032 + 0.0032). After calculating, we take the square root to find the total standard deviation, which is approximately 0.0183 cm, rounded to four decimal places.
A rectangle is growing such that the length of a rectangle is 5t+4 and its height is √t, where t is time in seconds and the dimensions are in inches. Find the rate of change of area, A, with respect to time.
Answer:
[tex]3\sqrt{t} +\frac{2}{\sqrt{t}}[/tex] square inches per seconds.
Step-by-step explanation:
given that a rectangle is growing such that the length of a rectangle is 5t+4 and its height is √t, where t is time in seconds and the dimensions are in inches
Area of rectangle = length * width
A = [tex]\sqrt{t} (5t+4)\\= 5t\sqrt{t} +4\sqrt{t}[/tex]
To find rate of change of A with respect to t, we can find derivative of A with respect to t.
WE get
[tex]\frac{dA}{dt} =5(\frac{3}{2} )\sqrt{t} +\frac{4}{2\sqrt{t} } \\= 3\sqrt{t} +\frac{2}{\sqrt{t}}[/tex]
Hence rate of change of area with respect to time is
[tex]3\sqrt{t} +\frac{2}{\sqrt{t}}[/tex] square inches per seconds.