Suppose a computer engineer is interested in determining the average weight of a motherboard manufactured by a certain company. A summary of a large sample provided to the engineer suggest a mean weight of 11.8 ounces and an estimated standard deviation, sigma = 0.75. How large a sample size is required if want a 99% confidence interval, with a tolerable interval width of 0.4? How large a sample would we need if were interested in a 95% confidence interval with a tolerable width of 0.5?

Answer:

Probability = 0.23572 .

Step-by-step explanation:

We are given that the length of time needed to complete a certain test is normally distributed with mean 35 minutes and standard deviation 15 minutes.

Let X = length of time needed to complete a certain test

Since, X ~ N([tex]\mu,\sigma^{2}[/tex])

The z probability is given by;

            Z = [tex]\frac{X-\mu}{\sigma}[/tex] ~ N(0,1)    where, [tex]\mu[/tex] = 35  and  [tex]\sigma[/tex] = 15

So, P(31 < X < 40) = P(X < 40) - P(X <= 31)

P(X < 40) = P( [tex]\frac{X-\mu}{\sigma}[/tex] < [tex]\frac{40-35}{15}[/tex] ) = P(Z < 0.33) = 0.62930

P(X <= 31) = P( [tex]\frac{X-\mu}{\sigma}[/tex] < [tex]\frac{31-35}{15}[/tex] ) = P(Z < -0.27) = 1 - P(Z <= 0.27)

                                               = 1 - 0.60642 = 0.39358

Therefore, P(31 < X < 40) = 0.62930 - 0.39358 = 0.23572 .  

To find the probability that it takes between 31 and 40 minutes to complete the test when the test completion times are normally distributed with a mean (μ) of 35 minutes and a standard deviation (σ) of 15 minutes, we can use the properties of the normal distribution.

Firstly, we need to standardize our times (31 and 40 minutes) to find the corresponding z-scores. The z-score is a measure of how many standard deviations an element is from the mean. We use the following formula to calculate the z-score:

\[ z = \fraction{(X - \mu)}{\sigma} \]

where:
- \( X \) is the value for which we are finding the z-score
- \( \mu \) is the mean
- \( σ \) is the standard deviation

We will calculate the z-scores for both 31 minutes and 40 minutes.

For \( X = 31 \):
\[ z_{31} = \fraction{(31 - 35)}{15} = \fraction{-4}{15} \approx -0.267 \]

For \( X = 40 \):
\[ z_{40} = \fraction{(40 - 35)}{15} = \fraction{5}{15} \approx 0.333 \]

Next, we look up these z-scores in the standard normal distribution (z-distribution) table, which will give us the area to the left of each z-score.

If we don't have the z-distribution table available, we might use statistical software or a calculator with a normal distribution function. But let's proceed as if we are using the z-table.

Let's say our z-table gives us the following areas:

Area to the left of \( z_{31} \approx -0.267 \): Approximately 0.3944 (please note that actual values will depend on the specific z-table or calculator you are using).

Area to the left of \( z_{40} \approx 0.333 \): Approximately 0.6304.

Now we want the area between these two z-scores, which represents the probability that the test completion time is between 31 and 40 minutes. To find this, we can subtract the area for \( z_{31} \) from the area for \( z_{40} \):

Probability \( P(31 < X < 40) = P(z_{40}) - P(z_{31}) \)

Substituting the values,

\[ P(31 < X < 40) = 0.6304 - 0.3944 = 0.2360 \]

So the probability that it will take between 31 and 40 minutes to complete the test is approximately 0.2360, or 23.60%.

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:

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.

To answer the student's questions regarding juvenile condor weights:

Answer:

20 liters of the 40% solution

60-20=40 liters of the 70% solution

Step-by-step explanation:

40%x+70%(60-x)=60%(60)

0.4x+0.7(60-x)=0.6(60)

0.4x+42-0.7x=36

-0.3x+42=36

-0.3x=-42+36

-0.3x=-6

0.3x=6

3x=60

x=60/3

x=20 liters of the 40% solution

60-20=40 liters of the 70% solution

check: 0.4*20=8

0.7*40=28

8+28=36 and 0.6*60=36 also

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.

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]

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]

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

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.

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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Answer:

Yp = t[Asin(2t) + Acos(2t)]

Yp = t²[At² + Bt + C]

Step-by-step explanation:

The term "multiplicity" means when a given equation has a root at a given point is the multiplicity of that root.

(a) r1=-2i; r2=2i g(t)=2sin(2t) + 3cos(2t)

As you can notice the multiplicity of this equation is 1 since the roots r1 = 2i and r2 = 2i appear for only once.

The form of a particular solution will be

Yp = t[Asin(2t) + Acos(2t)]

where t is for multiplicity 1

(b) r1=r2=0; r3=1 g(t)= t² +2t + 3

As you can notice the multiplicity of this equation is 2 since the roots r1 = r2 = 0 appears 2 times.

The form of a particular solution will be

Yp = t²[At² + Bt + C]

where t² is for multiplicity 2

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.

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.

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).

In 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.

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.

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.

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.

The z-scores for the given data values are approximately:

560: 0.6

650: 1.5

500: 0

450: -0.5

300: -2

Given the mean (μ) of 500 and the standard deviation (σ) of 100, we can calculate the z-scores for the provided data values:

The z-score (also known as the standard score) measures how many standard deviations a data point is away from the mean. It is calculated using the formula:

z = (x - μ) / σ

Where:

x is the data value

μ is the mean of the sample

σ is the standard deviation of the sample

For x = 560:

z = (560 - 500) / 100 = 0.6

For x = 650:

z = (650 - 500) / 100 = 1.5

For x = 500:

z = (500 - 500) / 100 = 0

For x = 450:

z = (450 - 500) / 100 = -0.5

For x = 300:

z = (300 - 500) / 100 = -2

So, the z-scores for the given data values are approximately:

560: 0.6

650: 1.5

500: 0

450: -0.5

300: -2

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The z-scores for the data values 560, 650, 500, 450, and 300 in a sample with a mean of 500 and a standard deviation of 100 are 0.6, 1.5, 0, -0.5, and -2 respectively. They are computed using the formula z = (X - μ) / σ.

This question refers to the concept of z-scores in statistics, which is a part of Mathematics. A z-score indicates how many standard deviations a given data point is from the mean. The formula to calculate the z-score is: z = (X - μ) / σ, where X is the data point, μ is the mean, and σ is the standard deviation.

The given sample has a mean (μ) of 500 and a standard deviation (σ) of 100. Let's calculate the z-scores:

So the z-scores for the data values 560, 650, 500, 450, and 300 are 0.6, 1.5, 0, -0.5, and -2 respectively.

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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]

In this problem:

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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Answer: a. 0.159

b. 0.841

C. 0.17

d. 0.034

e. 0.2133

F. 0.501

Step-by-step explanation:

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!!!

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.

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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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.

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)    

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 :

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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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.

Answer:

Step-by-step explanation:

Given Data

Suppose That [tex]y_{1}[/tex] is a solution of L[tex]y_{1}[/tex] = F(x)

and [tex]y_{2}[/tex] is a solution  of [tex]Ly_{2}[/tex] = g(x)

L is liner operator

∴ [tex]L(y_{1}+y_{2} )[/tex] = L[tex]y_{1}[/tex] +[tex]Ly_{2}[/tex]

L(y) = F(x) + g(x)

[tex]y_{1}+y_{2}[/tex] is the solution to  L(y) = F(x) + g(x)

E.g the liner operator be L = [tex]\frac{d}{dx}[/tex]

[tex]\frac{d}{dx}[/tex] [tex]y_{1}[/tex]  = f(x)

[tex]\frac{d}{dx}[/tex] [tex]y_{2}[/tex] = g(x)

[tex]\frac{d}{dx}[/tex] [tex](y_{1}+y_{2} )[/tex] = [tex]\frac{d}{dx}[/tex] [tex]y_{1}[/tex] + [tex]\frac{d}{dx}[/tex] [tex]y_{2}[/tex] = f(x) + g(x)

Final Answer:

y = y1 + y2 solves the equation Ly = f(x) + g(x).

Explanation:

Certainly! To prove the superposition principle for nonhomogeneous linear differential equations, we will utilize the properties of linear operators and the given solutions for the differential equations.
Let's define L as a linear differential operator. Being linear implies that for any functions u(x) and v(x), and any constants a and b, the operator satisfies the following properties:
1. L(u + v) = L(u) + L(v)  (additivity)
2. L(au) = aL(u)           (homogeneity)

Given there are two functions y1(x) and y2(x) that are solutions to the nonhomogeneous linear differential equations:
Ly1 = f(x)
Ly2 = g(x)

We need to prove that if you take a linear combination of y1 and y2, the result y = y1 + y2 will also be a solution to the combined nonhomogeneous equation Ly = f(x) + g(x).

Here's how we do it:
Consider a linear combination of y1 and y2, denoted as y = y1 + y2. Apply the linear operator L to both sides of this equation:
L(y) = L(y1 + y2)

Since L is a linear operator, we can apply the additivity property:
L(y) = L(y1) + L(y2)

Now, we know that y1 and y2 are solutions to their respective nonhomogeneous equations, so we can substitute f(x) for L(y1) and g(x) for L(y2):
L(y) = f(x) + g(x)

Thus, we have shown that y = y1 + y2 solves the equation Ly = f(x) + g(x).

This is the proof of the superposition principle for nonhomogeneous linear differential equations. It shows that solutions to such equations can be added together to obtain a new solution corresponding to the sum of the nonhomogeneous parts.

(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.

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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.

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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Answer:

A Not a probability B.Probability C.not a probability d.Probability E propability F.not a propability

Step-by-step explanation:

A propability of any event is a number between zero and one

A)175%  converted 1.75 so lies outside zero and one not a propability

B)5.91 lies outside the zero and one rage not a propability

C)0.66 lies in the zero and one rage therefore a propability

D)0.002 Lies within the zero and one range therefore a propability

E) -110% converted equals -1.1 so does not lies in this range not a propability

The following numbers could not be probabilities:

A. The number 175% could not be a probability because it is larger than 100%.

B. The number 5.91 could not be a probability because it is larger than 1.

E. The number negative 110% could not be a probability because it is negative.

Probabilities must be between 0 and 1, inclusive. This is because a probability represents the likelihood of an event occurring, and there is no event that can be more likely than certain (1) or less likely than impossible (0).

The numbers 0.66 and 0.002 are valid probabilities.

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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.

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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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.

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

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]

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