AP Statistics Midterm Review

Question 1

The mean age of 4 people is 30 years. A new person who is 55 joins the group. The new mean is

Accepted Answer

35

Question 2

Joe scored a 90 on the first exam. What is the predicted value of his final score?

Accepted Answer

91

Question 3

What is the probability a chosen student is left-handed or prefers to communicate in person?

Accepted Answer

.53

Question 4

You can roughly locate the median of a density curve by eye because it is the

Accepted Answer

point divides the area under the curve in 2 equal parts

Question 5

The standard deviation of 16 peoples' weights (lbs) is 5.4. What are the units for variance?

Accepted Answer

lbs^2

Question 6

Which graph represents the the distribution for political party registration for each gender?

Accepted Answer

E

Question 7

A set of data has a mean that is much larger than the median. What is the distribution's shape?

Accepted Answer

skewed right

Question 8

The fraction of variation in values of y that is explained by the least-squares regression is

Accepted Answer

square of the correlation coefficient

Question 9

Two variables are negatively associated if...

Accepted Answer

B

Question 10

If he fed Kent pellets to an SRS of 5 pigs from A, an SRS of 5 pigs from B, and rest Moorman:

Accepted Answer

block design

Question 11

The mean and standard deviation of this distribution are approximately

Accepted Answer

Mean = 190; Standard Deviation = 65

Question 12

A distribution is N(25, 8). If you standardize this distribution, it will have a..

Accepted Answer

mean of 0, standard deviation of 1

Question 13

The farmer conducted:

Accepted Answer

experiment - but not a completely randomized one

Question 14

What is the probability the card is a Jack, given that it is a face card?

Accepted Answer

1/3

Question 15

What is the percentile of the person whose score was 85?

Accepted Answer

71%

Question 16

The method of sampling used is

Accepted Answer

a convenience sample

Question 17

If the heights of 99.7% of American men are between 5' and 7', what is the standard deviation?

Accepted Answer

4"

Question 18

Given that a student who ate breakfast is selected, what is the probability that he is male?

Accepted Answer

.64

Question 19

The proportion of infants with birthrates under 95 oz is about

Accepted Answer

.159

Question 20

Which of the following can we conclude?

Accepted Answer

B

Question 21

If death rate was expressed as deaths per 1,000 people instead of 100,00 - how would r change?

Accepted Answer

r would not change

Question 22

The observed correlation is most likely due to...

Accepted Answer

A

Question 23

How many free throws does he hit in the first simulation of five shots?

Accepted Answer

5

Question 24

The collection of all possible outcomes of a random phenomenon is called

Accepted Answer

the sample space

Question 25

Is he right or wrong?

Accepted Answer

He's wrong - successive deals are independent of each other.

Question 26

The placebo effect and subconscious bias are avoided by using

Accepted Answer

the double-blind technique

Question 27

This is a(n)

Accepted Answer

observational study

Question 28

The sample from Korea is a

Accepted Answer

stratified random sample

Question 29

P(A u B) =

Accepted Answer

5/6

Question 30

The most important advantage of experiments over observational studies is that

Accepted Answer

experiments give better evidence of causation

Question 31

Which of the following statements about the shape of this distribution is true?

Accepted Answer

The distribution is skewed.

Question 32

What percent of schools have an acceptance rate under 20%?

Accepted Answer

4%

Question 33

The events A and B are:

Accepted Answer

not independent, not disjoint

Question 34

This means that...

Accepted Answer

D

Question 35

This poll is likely to...

Accepted Answer

B

Question 36

We may conclude that the correlation between X and Y is...

Accepted Answer

C

Question 37

The equation of the least-squares regression line is

Accepted Answer

Eggs = -142.74 + 39.25(Length)

Question 38

In probability and statistics, a random phenomenon is

Accepted Answer

D

Question 39

What is P(A u B)?

Accepted Answer

q + r + s

AP Statistics Midterm Review

Questions 39

AP Statistics Midterm Review

Questions 39