Answer:
non sampling error
Step-by-step explanation:
Sampling error in a statistical analysis arising from the unrepresentativeness of the sample taken.
Non Sampling error is a term used in statistics that refers to an error that occurs during data collection, causing the data to differ from the true values.
Answer:
sampling error
Step-by-step explanation:
A soccer ball is kicked from the ground with an initial upward velocity of 90 feet per second. The equation h=-16t^2+90t gives the height h of the ball after t seconds. Find the maximum height of the ball.
Answer:
[tex]h_{max} = 30.012\,ft[/tex]
Step-by-step explanation:
The maximum height of the soccer can be determined with the help of the First Derivative and Second Derivative Tests, whose expression are introduced below:
[tex]\frac{dh}{dt} = -32\cdot t + 90[/tex]
[tex]-32\cdot t + 90 = 0[/tex]
[tex]t = 0.356\,s[/tex]
[tex]\frac{d^{2}h}{dt^{2}} = -32[/tex]
According to both tests, the critical value leads to maximum height. Then:
[tex]h_{max} = -16\cdot (0.356)^{2}+90\cdot (0.356)[/tex]
[tex]h_{max} = 30.012\,ft[/tex]
Vera claimed the solution set on the number line represents the inequality Negative 78.9999 greater-than-or-equal-to x. A number line going from negative 82 to negative 78. A closed circle is at negative 79. Everything to the left of the circle is shaded. Which error did Vera make? Vera wrote the inequality with the variable on the left side of the relation symbol. Vera wrote a relation symbol that does not represent the direction of the ray. Vera selected an inequality that does not include –79 in its solution set. Vera used the wrong number in her inequality.
Answer:
Vera used the wrong number in her inequality.
Step-by-step explanation:
Inequalities are graphed to present a clearer picture of their behavior
To graph an inequality, the following are required steps
(1) Locate the indicated number on the other side of the inequality sign variable x in the inequality equation (in this case we have 78.9999 ≥ x)
(2) Draw a number line and place an open or shaded circle around around the number specified in the inequality equation depending on whether the variable is also equal to the number
(3) Shade the possible numbers of the variable
In this case Vera used 78.999 in the equation and 79 on the graph
Answer:
Vera used the wrong number in her inequality.
Step-by-step explanation:
Vera graphed the inequality -78.9999 ≥ x. However, she plotted the point at -79, not -78.9999. Thus, we can tell the answer is Vera used the wrong number in her inequality.
Hope this helps! I got it right on E d g e n u i t y. Plz give me brainliest, it will help me achieve my next rank.
A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 48.048.0 and 53.053.0 minutes. Find the probability that a given class period runs between 50.550.5 and 51.7551.75 minutes.
Answer:
Probability = 0.241
Step-by-step explanation:
We can find the probability that a given class period runs through the given time recognizing that a uniform probability distribution is mostly a rectangle with an area equal to 1.
Therefore,
Probability = 51.7551 - 50.550/53.053 - 48.0480 = 1.2057/5.005
= 0.241
Answer:
The probability of selecting a class that runs between 50.550.5 and 51.7551.75 minutes is 0.24
Step-by-step explanation:
A uniform distribution is a flat distribution that has the same probability density for every number. The area under the graph of the distribution must be 1. Since this distribution runs from 48.048.0 to 53.053.0 minutes,
it has a range of 5.005 (53.053.0 - 48.048.0).
The density must be 1/5.005 ≅ 0.2, so that 5.005*0.2 ≅ 1.0.
To find the probability of being between two numbers multiply the range between the numbers by the probability density.
range:51.7551.75 - 50.550.5 ≅ 1.2
1.2*0.2 = 0.24
P(50.550.5 < x < 51.7551.75) = 0.24
The probability of selecting a class that runs between 50.550.5 and 51.7551.75 minutes is 0.24
please help ! i got through half the problem - i just can't figure out how to split the $2 to jay and kay. giving out brainliest !!
Jay, Kay, and Lee are hiking. Lee forgot to bring water. Jay brought 2 gallons of water and Kay brought 1.75 gallons of water. The three of them agree to divide all the water equally among them. Lee gives $2 for the water he receives, which Jay and Kay agree to divide fairly between the two of them. How much money should Jay receive?
Answer:
The answer to your question is Jay will receive $1.07 and Kay will receive $0.93.
Step-by-step explanation:
Data
Jay brought 2 gallons
Kay brought 1.75 gallons
Money = $2
Process
1.- Calculate the total amount of water
Water = 2 + 1.75
= 3.75 gallons
2.- Calculate the money Jay will receive using proportions
3.75 gallons ---------------- $2.00
2 gallons --------------- x
x = (2 x 2) / 3.75
x = 4/3.75
x = $1.07
3.- Calculate the money Kay will receive using proportions
3.75 gallons ----------------$2.00
1.75 gallons --------------- x
x = (1.75 x 2.00) / 3.75
x = 3.5/3.75
x = $0.93
Jane must select three different items for each dinner she will serve. The items are to be chosen from among five different vegetarian and four different meat selections. If at least one of the selections must be vegetarian, how many different dinners could Jane create?
A. 30
B. 40
C. 60
D. 70
E. 80
Answer:
E. 80
Step-by-step explanation:
First consider exactly what the problem is asking. You have to make a dinner and AT LEAST one of the dishes has to be vegetarian. So then we could have all three be vegetarian (V V V), 2 vegetarian with one meat (V V M), or one vegetarian with 2 meat (V M M). If I can find the number of arrangements possible for each of the possibilities and add them, we should have our answer.
Consider first the all vegetarian option. There are 5 vegetarian meals on the menu and we may choose 3 of them. This will be a combination since the order in which we choose doesn't matter. For example if my 5 vegetarian dishes are salad, hummus, rice, lentils and pasta, it doesn't matter what order I serve them in, since they will all be a part of the meal. Simply put, placing hummus, rice, and lentils on the table is the same as placing rice, lentils and hummus on the table if everybody shares the dishes. If I had specific guests assigned to the each dish then the order would matter, and it would be a permutation. For example if three of Jane's guests, (lets say Mike, Frank, and Bob) are going to have a specific dish, then the arrangement where Mike has rice, Bob has lentils, and Frank has pasta is different from the arrangement where Mike has lentils, Bob has rice, and Frank has pasta. Since there is no mention of a specific order this has to go in, it is safe to assume a combination. So how many ways can we choose 3 vegetarian dishes from 5 options? This will be 5 C 3.
So we found that (V V V) gives us 5 C 3, so lets examine the other remaining cases. (V V M) implies from 5 vegetarian options we can choose 2 and from 4 meat options we choose one. Then (V V M) gives us 5 C 2 * 4 C 1. Likewise for (V M M) we can say 5 C 1 * 4 C 2.
Putting it all together we have 5 C 3 + 5 C 2 * 4 C 1 + 5 C 1 * 4 C 2. 10 + 10*4 +5 *6 =80.
PLLLZ HELP Find Sn if a1 = 20, d = –10, and n = 25.
–2500
–2750
2500
–5000
Option A: [tex]-2500[/tex] is the value of [tex]S_{25[/tex]
Explanation:
It is given that the first term is [tex]a_1=20[/tex]
The common difference is [tex]d=-10[/tex]
We need to determine the sum of 25 terms.
The sum of terms of an arithmetic series can be determined using the formula, [tex]S_n=\frac{n[2a_1+(n-1)d]}{2}[/tex]
Substituting [tex]n=25[/tex] , [tex]a_1=20[/tex] and [tex]d=-10[/tex]
Thus, we have,
[tex]S_{25}=\frac{25[2(20)+(25-1)(-10)]}{2}[/tex]
Simplifying the values, we get,
[tex]S_{25}=\frac{25[40+(24)(-10)]}{2}[/tex]
[tex]S_{25}=\frac{25[40-240]}{2}[/tex]
Subtracting the terms within the bracket, we get,
[tex]S_{25}=\frac{25[-200]}{2}[/tex]
Multiplying the terms in the numerator, we have,
[tex]S_{25}=\frac{-5000}{2}[/tex]
Dividing, we get,
[tex]S_{25}=-2500[/tex]
Thus, the sum of the 25 terms is [tex]-2500[/tex]
Therefore, Option A is the correct answer.
Answer:
-2500 answer
Step-by-step explanation:
For how many values of k is it true that |k - 3| + 2 is equal to one?
A) One
B) Two
C) None
D) More than two
Answer:
C) None
Step-by-step explanation:
|k - 3| + 2 = 1
|k - 3| = -1
Which is not possible because a mod can never be negative
Final answer:
There are zero values of k that make the equation |k - 3| + 2 = 1 true because the absolute value of any number cannot be negative.
Explanation:
To determine for how many values of k the equation |k - 3| + 2 = 1 is true, we need to consider what the absolute value represents. The absolute value of a number is its distance from 0 on the number line, regardless of direction.
Thus, |k - 3| represents the distance of k from 3.
First, we simplify the equation by subtracting 2 from both sides:
|k - 3| = -1
Since the absolute value of a number is always non-negative, there can be no real number k that would make |k - 3| equal to -1.
Therefore, there are zero values of k that would satisfy the original equation.
An NHL hockey player has 59 goals so far in season what are the possible numbers of additional goals the player can score to make or break the NHL record of 92 goals in a season
Answer:
53 by the fact NFL players use a for wheeler u Dan je e eka a f wjd r
Please someone help me on 2 problems 25 points ya boy be struggling
Answer:
6) x = 17 ft
7) 42 in
Step-by-step explanation:
6) length of the tangents are equal.
2x - 7 = 27
2x = 34
x = 17
7) if you draw a line from T passing through the centre of the circle, it will divide the triangle into two congruent triangles
Perimeter = 2(5+7+9) = 42 in
Solve the system of equations.
-5y+6x=40
3y-8x=-46
x=
y=
Answer:
X=5
Y=-2
Step-by-step explanation:
Answer:
x = 5
y = -2
Step-by-step explanation:
Let's solve the system of equations, this way:
-5y + 6x = 40
3y - 8x = -46
******************
-5y + 6x = 40
6x = 40 + 5y
x = (40 + 5y)/6
******************
Substituting x and solving for y in the 2nd equation:
3y - 8x = - 46
3y - 8 * [(40 + 5y)/6] = - 46
3y - (320 + 40y)/6 = - 46
18y - 320 - 40y = - 276 (Multiplying by 6 at both sides)
-22y = - 276 + 320 (Adding 320 at both sides)
-22y = 44
y = -44/22
y = -2
**************************
Solving for x in the 1st equation:
-5y + 6x = 40
-5 * - 2 + 6x = 40
10 + 6x = 40
6x = 40 - 10 (Subtracting 10 at both sides)
6x = 30
x = 30/6
x = 5
A landscaping company charges a $10 fee to make a house call plus an hourly rats for labor. If the total bill for a job that takes two hours comes to $61.00 write an equation that can be used to solve for the hourly labor rate
Answer:
61 divided by 10 and that should even out how many hours they worked
Step-by-step explanation:
Answer: the equation that can be used to solve for the hourly labor rate is
2x + 10 = 61
Step-by-step explanation:
Let x represent the amount charged by the landscaping company per hour of labour.
The landscaping company charges a $10 fee to make a house call plus an hourly rate for labor. This means that the total charge for y hours is
xy + 10
If the total bill for a job that takes two hours comes to $61.00, the equation that can be used to solve for the hourly labor rate would be
2x + 10 = 61
A CHAIR regular is 349.It is on clearance for 30% off and a customer uses a 15% off coupon after that. What is the final cost of the chair before sales tax
Answer:
$207.655
Step-by-step explanation:
Firstly, we calculate the value taken off the cost by the clearance sales tag.
That would be 30/100 * 349 =104.7
We subtract this from the original = 349-104.7 = 244.3
Now, he applied a 15% coupon. That would be 15/100 * 244.3 = 36.645
The cost of the chair before sales tax = 244.3-36.645 = 207.655
Brainliest + 20 points to whoever helps!!!
Under which circumstances should you use a two-population z test?
a. The standard deviation is unknown.
b. The sample size is less than 30.
c. The population is slightly skewed and n > 40.
d. The standard deviation is known and n > 30.
Answer:
D. The standard deviation is known and n > 30.
Step-by-step explanation:
Your sample size is greater than 30.Data points should be away from each other.Your data should be commonly categorized. Your data should be randomly picked from a population. Each item should have an equal chance of being selected. The sample sizes should be equal.A two-population z test should be used when the standard deviation is known and the sample size is greater than 30.
Explanation:The circumstances under which you should use a two-population z test are:
The standard deviation is known and the sample size is greater than 30.Learn more about Two-population z test here:https://brainly.com/question/32498061
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Ramon wants to cut a rectangular board into identical square pieces. If the board is 18 inches by 30 inches, what is the least number of square pieces he can cut without wasting any of the board?
Answer: 15
Step-by-step explanation:
Answer:
he have to kep cutting them until he find out he answer
Step-by-step explanation:
What is the area of the largest circular fire that can be made in this fire pit? Use 3.14 for π. Round to the nearest square inch.
!no absurd answers, please! : (
Area of the largest circle fit in the fire pit is 4069.44 square inches.
Solution:
Length of the rectangular pit = 7 feet
Width of the rectangular pit = 6 feet
The diameter of a largest circle inscribed in a rectangle is equal to the smaller side of the rectangle.
Diameter of the largest circle = 6 feet
Radius of the largest circle = 3 feet
Area of the circle = πr²
= 3.14 × 3²
Area of the circle = 28.26 square feet
Let us convert square feet into square inches.
1 square feet = 144 square inches
28.26 square feet = 28.26 × 144
= 4069.44 square inches
Area of the largest circle fit in the fire pit is 4069.44 square inches.
If the risk-free rate is 7 percent, the expected return on the market is 10 percent, and the expected return on Security J is 13 percent, what is the beta of Security J
Answer:
0.02 or 2% = Beta
Step-by-step explanation:
Given that,
Risk-free rate = 7 percent
Expected return on the market = 10 percent
Expected return on Security J = 13 percent
Therefore, the beta of Security J is calculated as follows;
Expected return on Security J = Risk-free rate + Beta (Expected return on the market - Risk-free rate)
13 percent = 7 percent + Beta (10 percent - 7 percent)
0.13 - 0.07 = 0.03 Beta
0.06 = 0.03 Beta
0.06 ÷ 0.03 = Beta
0.02 or 2% = Beta
A consumer organization inspecting new cars found that many had appearance defects. While none had more than 3 defects, 7% had three, 11% had two, and 21% had one defect. Find the expected number of appearance defects in a new car, and the standard deviation.
Answer:
E(X) = 0.64
Sd(X) = 0.933
Step-by-step explanation:
3(0.07) + 2(0.11) + 1(0.21)
E(X²) = 3²(0.07) + 2²(0.11) + 1²(0.21)
= 1.28
Var(X) = 1.28 - 0.64² = 0.8704
Sd = 0.933
Francisco's game involves a bag of 3 green, 2 yellow, 4 red, and 3 black marbles. Andrew wants to increase the likelihood of selecting a yellow marble. How can the game be modified to make drawing a yellow marble more likely? Select all that apply.XAndrew should add more green marbles to the bag.-Andrew should add more yellow marbles to the bag.-Andrew should remove from the bag 1 green, 1 black, and 2 red marbles.XAndrew should add more black marbles to the bag-Andrew should triple the number of yellow marbles in the bag.
To increase the likelihood of selecting a yellow marble Andrew should:
-Add more yellow marbles to the bag
-Remove from the bag 1 green, 1 black, and 2 red marbles
-Triple the number of yellow marbles in the bag
Answer:
B,C,E
Step-by-step explanation:
just did it
Plz help
The volume of the rectangular prism is 60x3 + 145x2 + 70x. Factor to find the possible expressions for length, width and height of the prism.
4x(5x + 7)(3x + 2)
x(2x + 7)(10x + 1)
5x(4x + 7)(3x + 2)
5x(7x + 4)(3x + 2)
Option C: [tex]5 x(4 x+7)(3 x+2)[/tex] is the possible expressions for length, width and height of the prism.
Explanation:
The volume of the rectangular prism is [tex]60 x^{3}+145 x^{2}+70 x[/tex]
To determine the length, width and height of the rectangular prism, let us factor the expression.
Thus, factoring 5x from the expression, we have,
[tex]5 x\left(12 x^{2}+29 x+14\right)[/tex]
Let us break the expression [tex]12 x^{2}+29 x+14[/tex] into two groups, we get,
[tex]5x[\left(12 x^{2}+8 x\right)+(21 x+14)][/tex]
Factoring 4x from the term [tex]12 x^{2}+8 x[/tex] , we get,
[tex]5x[4 x(3 x+2)+(21x+14)][/tex]
Similarly, factoring 7x from the term [tex]21 x+14[/tex] , we get,
[tex]5x[4 x(3 x+2)+7(3x+2)][/tex]
Now, let us factor out [tex]3x+2[/tex], we get,
[tex]5 x(4 x+7)(3 x+2)[/tex]
Hence, the possible expressions for length, width and height of the prism is [tex]5 x(4 x+7)(3 x+2)[/tex]
Therefore, Option C is the correct answer.
A bag contains 4 red, 5 blue, and 6 green marbles: One blue marble is selected and NOT replaced. If a 2nd marble is drawn, what is the probability that the 2nd marble drawn is a blue marble? Write your answer as a simplified fraction.
Answer:
2/7
Step-by-step explanation:
To find the this first you need the total number of marbles minus one since the blue marble was taken.
4+5+6-1=14
after one blue marble being picked there are 4 blue left, so the fraction is
4/14 and after being simplified it is 2/7
Answer:
the true is the answer is g
Step-by-step explanation:
Use the value of the linear correlation coefficient r to find the coefficient of determination and the percentage ofthe total variation that can be explained by the linear relationship between the two variables. r = 0.885 (x = weight of male, y = waist size of male)
Answer:
Step-by-step explanation:
The coefficient of determination = [tex]r^{2} = 0.885^{2}[/tex] = 0.7832
It means about 78% variation in waist size of males can be explained by their weight and about 23% can not be explained.
a. I have five coins in my pocket – four are fair, and the other is weighted to have a 70% chance of coming up heads. I pull one out at random and flip it three times. What is the conditional probability that I get four heads given I pulled out the weighted coin?
Answer:
The conditional probability that I get four heads given I pulled out the weighted coin = 0.2401
Step-by-step explanation:
Probability of getting 4 heads from 4 trials for a fair coin = 0.5⁴
But given that it is the weighted coin that is pulled out,
The probability of getting 4 heads from 4 trials = 0.7⁴ = 0 2401
what is the approximate volume of the cylinder? use 3.14 for TT 7 cm radius 26 cm height
The volume of the cylinder is [tex]4000.36 \ cm^3[/tex]
Explanation:
Given that the radius of the cylinder is 7 cm
The height of the cylinder is 26 cm
We need to find the volume of the cylinder.
The volume of the cylinder can be determined using the formula,
[tex]Volume = \pi r^2 h[/tex]
Let us substitute the values [tex]\pi= 3.14[/tex] , [tex]r=7[/tex] and [tex]h=26[/tex] in the above formula.
Thus, we have,
[tex]Volume = (3.14)(7)^2(26)[/tex]
Simplifying the terms, we get,
[tex]Volume = (3.14)(49)(26)[/tex]
Multiplying the terms, we have,
[tex]Volume = 4000.36 \ cm^3[/tex]
Thus, the approximate volume of the cylinder is [tex]4000.36 \ cm^3[/tex]
Chris wants to fence three sides of a rectangular exercise yard for his dog. The fourth side of the exercise yard will be a side of the house. He has
120
feet of fencing available. Find the dimensions that will enclose the maximum area.
The fence parallel to the house is ___
feet, the fence perpendicular to the house is ____
feet and the area of the yard is ____
square feet.
Answer:
parallel: 60 ftperpendicular: 30 ftarea: 1800 ft^2Step-by-step explanation:
Let x represent the length of fence parallel to the house. Then the length perpendicular is ...
y = (120 -x)/2
The area of the yard is the product of these dimensions, so is ...
A = xy = x(120-x)/2
This is the equation of a parabola that opens downward and has zeros at x=0 and x=120. The maximum (vertex) is on the line of symmetry, halfway between these zeros, at x=60.
The fence parallel to the house is 60 feet.
The fence perpendicular to the house is (120-60)/2 = 30 feet.
The area of the yard is (60 ft)(30 ft) = 1800 ft^2.
Chelsea collects sand dollars.The number she has collected is greater than 400 and less than 460.The number in hundreds place is one less than the number in the tens place.The number in the ones place is two more than the number in the tens place.How many sand dollars has Chelsea collected?
Answer:
457 sand dollars
Step-by-step explanation:
Let the number=x
The number she has collected is greater than 400 and less than 460
400<x<460
The number in hundreds place is one less than the number in the tens place.
The number in the Hundreds place is 4. Since it is one less, our number for now will be of the form 45* where * is the ones digit.
Also, the number in the ones place is two more than the number in the tens place.
The number in the tens place is 5. If it is two more than 5, the number in the ones place is 7.
Therefore Chelsea has collected 457 sand dollars
A rectangle is constructed with its base on the diameter of a semicircle with radius 2 and with its two other vertices on the semicircle. What are the dimensions of the rectangle with maximum area?
Answer:
L = 2*√2
w = √2
Step-by-step explanation:
Given:
A rectangle is constructed with its base on the diameter of a semicircle with radius 2 and with its two other vertices on the semicircle.
Find:
What are the dimensions of the rectangle with maximum area?
Solution:
- Let the length and width of the rectangle be L and w respectively.
- We know that Length L lie on the diameter base. So , L < 4 and the width w is less than 2 . w < 2.
- Using the Pythagorean Theorem, we relate the L with w using the radius r = 2 of the semicircle.
r^2 = (L/2)^2 + (w)^2
sqrt (4 - w^2 ) = L / 2
L = 2*sqrt (4 - w^2 ) L < 4 , w < 2
- The relation derived above is the constraint equation and the function is Area A which is function of both L and w as follows:
A ( L , w ) = L*w
- We substitute the constraint into our function A:
A ( w ) = 2*w*sqrt (4 - w^2 )
- Now we will find the critical points for width w for which A'(w) = 0
A'(w) = 2*sqrt (4 - w^2 ) - 2*w^2 / sqrt (4 - w^2 )
0 = [2*sqrt (4 - w^2 )*sqrt (4 - w^2 ) - 2*w^2] / sqrt (4 - w^2 )
0 = 2*(4 - w^2 ) - 2*w^2
0 = -4*w^2 + 8
8/4 = w^2
w = + sqrt ( 2 ) ..... 0 < w < 2
- From constraint equation we have:
L = 2*sqrt (4 - 2 )
L = 2*sqrt(2)
Find a1, d, and the Explicit Rule for this arithmetic sequence: -3, 4, 11, 18, 25, ...
1.)a1 =-3, d=-7, an = -7n - 3
2.)a1 =-3, d = 7, an = 7n - 10
3.)21 = -3, d =-7, an = -7n - 10
4.)a1 = -3, d = 7, an = 7n - 3
Answer:
2
Step-by-step explanation:
Answer: 2.)a1 =-3, d = 7, an = 7n - 10
Step-by-step explanation:
In an arithmetic sequence, consecutive terms differ by a common difference.
The formula for determining the nth term of an arithmetic sequence is expressed as
an = a1 + d(n - 1)
Where
a represents the first term of the sequence.
d represents the common difference.
n represents the number of terms in the sequence.
From the information given,
a1 = - 3
d = 4 - - 3 = 11 - 4 = 18 - 11 = 25 - 18 = 7
Therefore, the Explicit Rule for this arithmetic sequence is
an = - 3 + 7(n - 1)
an = - 3 + 7n - 7
an = 7n - 7 - 3
an = 7n - 10
A student in statistics argues that the concepts of mutually exclusive events and independent events are really the same, and that if events are mutually exclusive they must be independent. Do you agree with this statement
Answer:
No, Mutually exclusive events and Independent events are not the same.
Step-by-step explanation:
Mutually exclusive events and Independent events are not the same.
Mutually Exclusive Events:Mutually exclusive events are those events that cannot occur together, i.e. they cannot take place at the same time.
For example, the events of tossing a Head and Tails are mutually exclusive. This is because when a coin is flipped it cannot land on both sides at once.
Independent Events:Independent events are those events that can occur at the same time without affecting each other, i.r. they are not dependent on the occurrence of other events in the sample space.
For example, on rolling two fair die the events of first die rolling 4 and the second die rolling 1 are independent.
Final answer:
Mutually exclusive events cannot occur simultaneously, which means P(A AND B) = 0. Independent events occur independently of each other, and their combined probability is P(A AND B) = P(A)P(B). They are different concepts; being mutually exclusive does not imply events are independent.
Explanation:
No, the statement that mutually exclusive events and independent events are the same is incorrect. Mutually exclusive events are two or more events that cannot happen at the same time. For example, when tossing a coin, the events of landing on heads and tails are mutually exclusive because the coin cannot land on both sides at once. This means that P(A AND B) = 0 for mutually exclusive events A and B.
Independent events, however, are those where the occurrence of one event does not affect the probability of the other event occurring. In other words, events A and B are independent if the probability of A occurring is the same, regardless of whether B has occurred, and vice-versa. This means that P(A AND B) = P(A)P(B) for independent events A and B.
Therefore, while mutually exclusive events must have a combined probability of zero (they cannot both occur), independent events are characterized by one event's occurrence not influencing the probability of the other event occurring. Essentially, mutually exclusive deals with the impossibility of events happening simultaneously, whereas independence is about the absence of any causal connection between them.
If a student places in the 99th percentile on an exam, she performed better than 99% of all students who completed the exam. Her performance is similar to a statement based on a __________.
Answer:
Cumulative frequency distribution
Step-by-step explanation:
Cumulative frequency distribution is a form of a frequency distribution that represents the sum of a class and all classes below it. Remember that frequency distribution is an overview of all distinct values (or classes of values) and their respective number of occurrences.
Final answer:
Placing in the 99th percentile means a student did better than 99% of test takers, akin to scoring beyond the second standard deviation, a high achievement.
Explanation:
If a student places in the 99th percentile on an exam, this indicates that her performance was better than 99% of all students who completed the exam. Her achievement is akin to being beyond the second standard deviation in the context of a normal distribution, showing an exceptional score. In the given context, this means she likely scored higher than what is considered the range for the majority of her peers.
Being in the 90th percentile would indicate that 90 percent of test scores were at or below that mark, a clear demonstration of high achievement compared to peers. In educational measurement, the choice between absolute rating and relative ranking can greatly affect the evaluation of student performance. With relative ranking, a student's performance is compared against that of their peers, such as being in the top 10% as opposed to achieving a specific score percentage, which would be an absolute rating.
Determine whether the statement is sometimes, always, or never true.
If ax + b - 4 = b and a doesn't = 0 then x = 4/a
sometimes
always
not enough information provided
never
Answer:
always true
Step-by-step explanation:
Adding 4-b to both sides of the equation gives ...
ax = 4
Then dividing by "a" gives ...
x = 4/a
This is always true when a≠0.