Quiz about AP Statistics Course Check #1

Question 1

This is an example of a

Accepted Answer

histogram

Answer

frequency table

Answer

dot plot

Answer

box-and-whisker

Question 2

Is the data skewed right, left, or symmetrical?

Accepted Answer

right

Answer

left

Answer

symmetrical

Question 3

What is the IQR of this data set?
37 42 48 51 52 53 54 54 55

Accepted Answer

9

Answer

5

Answer

6

Answer

8

Question 4

What percent does each of the 4 sections contain on a box and whisker plot?

Accepted Answer

25%

Answer

100%

Answer

75%

Answer

50%

Question 5

Which of the following is an example of categorical data?

Accepted Answer

High School Graduate or Not

Answer

Annual Income

Answer

Years of Schooling Completed

Answer

Years of playing an instrument

Question 6

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 29

Accepted Answer

2.26

Answer

16.45

Answer

-2.26

Answer

1.26

Question 7

Find the mean.

Z-score = -1.4

Standard Deviation: 7

x = 20

Accepted Answer

29.8

Answer

10.2

Answer

-21

Answer

35

Question 8

Describe the correlation in the graph shown.

Accepted Answer

Strong Positive

Answer

Strong Negative

Answer

Weak Negative

Answer

Weak Positive

Question 9

What letter do we use to represent correlation coefficient?

Accepted Answer

r

Answer

c

Answer

p

Answer

h

Question 10

Is r = -0.87 strong, moderate, or weak?

Accepted Answer

strong

Answer

moderate

Answer

weak

Question 11

Estimate the value of r:

Accepted Answer

-0.72

Answer

0.03

Answer

-0.99

Answer

0.79

Question 12

How do you calculate a residual?

Accepted Answer

Observed - Predicted

Answer

Predicted - Observed

Question 13

What type of correlation exists between the temperature outside and the number of hot chocolate sold at a football game.

Accepted Answer

negative

Answer

positive

Answer

no correlation

Answer

unknown

Question 14

Kim surveys 100 moviegoers that entered the movie theater in the first hour.  What type of sampling method is this?

Accepted Answer

Convenience

Answer

Random

Answer

Biased

Question 15

A large company wants to conduct a survey to determine the proportion of its male employees who practice yoga on a daily basis. Two of its regional offices are chosen at random and all of the male employees at each office are surveyed. The plan is an example of which type of sampling?

Accepted Answer

Cluster

Answer

Convenience

Answer

Simple random

Answer

Stratified random

Answer

Systematic

Question 16

Joe Mama wants to do an observational study comparing height and weight. He also does a study comparing weight and calories consumed daily. He concludes that the more calories you consume, the more you weigh. And people who weigh more are generally taller. Therefore, if you eat more, you will get taller. Why is this incorrect?

Accepted Answer

Correlation does not indicate causation

Answer

Causation from one observational study cannot be extrapolated and applied to another

Answer

He is ignoring the lurking variable of age

Answer

He did not have a control group

Question 17

Every possible group of units of the required size has the same chance of being the selected sample as any other sample of the same size.

Accepted Answer

Simple Random

Answer

Thoughtful

Answer

Typical

Answer

Proportional

Question 18

This sample is selected by dividing the population into subgroups and then taking a fixed number of units from each group using the simple random sample.

Accepted Answer

stratified

Answer

cluster

Answer

judgment

Answer

experimental

Question 19

A company states that 2% of its computers are returned for defects.  We take a sample of 100 computers to find the probability of 10 being defective.  Is this a binomial distribution?

Accepted Answer

Yes since there are a fixed number of independent trials, outcomes in 2 categories, and the probability of defect is constant.

Answer

No because there is not a fixed number of trials.

Answer

No because their are more than 2 outcomes.

Answer

No since computers would not be independent.

Question 20

On an eight question multiple choice quiz with 4 answers for each question, what is the probability of guessing and getting 6 correct answers?

Accepted Answer

.004

Answer

.109

Answer

.003

Answer

.9996

Question 21

P(Sandals):

Accepted Answer

5/9

Answer

16/22

Answer

20/36

Answer

20/16

Question 22

Find the area under the standard normal curve where z < 2.42 .

Accepted Answer

.992

Answer

.008

Answer

.301

Answer

.862

Question 23

In the formula shown, what is in the denominator?

Accepted Answer

Sample Standard Deviation

Answer

Sample Mean

Answer

Individual Score

Answer

Sample Variance

Question 24

What is the probability that a family doesn't have a baby girl until their third child?

Accepted Answer

0.13

Answer

0.15

Answer

0.05

Answer

0.88

Question 25

The probability that Jalen makes a free throw is 75%. What is the probability he makes his first free throw on his third attempt?

Accepted Answer

geometpdf(0.75, 3)

Answer

geometcdf(3, 0.75)

Answer

geometpdf(3, 0.75)

Answer

geometcdf(0.75, 3)

Question 26

Given the probability model in the table below, what is the expected value of the random variable?
X 50 20 5
P(X) 0.1 0.3 0.6

Accepted Answer

14

Answer

4.67

Answer

5

Answer

7.5

Question 27

A coin is flipped 3 times. If you get tails once you get $5, tails twice you get $15, and tails on all three flips you get $40. What is the expected amount of money you will get?

Accepted Answer

$12.50

Answer

$5

Answer

$7.50

Answer

$10

Question 28

The Gallup Poll asked a random sample of 1785 adults whether they attended church during the past week. Let p-hat be the proportion of people in the sample who attended church. A newspaper report claims that 40% of all U.S. adults went to church last week. Suppose this claim is true.

What is the mean of the sampling distribution of p-hat?

Accepted Answer

0.40

Answer

0.44

Answer

0.56

Answer

0.60

Question 29

What happens to the shape of a sampling distribution of sample means as n increases?

Accepted Answer

It becomes narrower and more normal.

Answer

It becomes narrower and bimodal.

Answer

It becomes wider and skewed right.

Answer

It becomes wider and more normal.

Question 30

These symbols represent the mean and standard deviation for which of the following distributions?

Accepted Answer

The Sample

Answer

The Population

Answer

The Sampling Distribution

Question 31

These symbols represent the mean and standard deviation for which of the following distributions?

Accepted Answer

The Sampling Distribution

Answer

The Population

Answer

The Sample

Question 32

These symbols represent the mean and standard deviation for which of the following distributions?

Accepted Answer

The Population

Answer

The Sample

Answer

The Sampling Distribution

Question 33

A random sample of 49 medical doctors in LA showed that they worked an average of 53.1 hours/week with a standard deviation of 7.2 hours/week. If the California average is 60 hours/week, does this give evidence that the LA doctors work significantly less than the rest of California? What test should be used?

Accepted Answer

One-Sample T Test for a Mean

Answer

One-Sample Z Test for a Mean

Answer

One-Sample T Test for a Proportion

Answer

One-Sample Z Test for a Proportion

Question 34

USA Today reported that in 1992, 39% of all elementary school children claimed that when they grow up they want to do something to help other people. However, in 1995, 128 of a random sample of 317 of these same children claimed that when they grow up they want to do something to help other people. Does this information indicate that there has been an attitude change either way? What test should be used?

Accepted Answer

One-Sample Z Test for a Proportion

Answer

Two-Sample Z Test for the Difference in Proportions

Answer

One-Sample T Test for a Mean

Answer

Two-Sample T Test for the Difference in Means

Question 35

The manager of a sporting goods store offered a bonus commission to his salespeople when they sold moregoods. A new manager dropped the bonus system. For a random sample of six sales people, the weeklysales (in thousands of dollars) are shown in the following table with and without the bonus system

Salesperson 1 2 3 4 5 6

with bonus 2.9 3.0 5.8 4.4 5.3 5.6

w/o bonus 2.8 2.5 5.9 3.5 4.6 4.6

difference 0.1 0.5 -0.1 0.9 0.7 1.0

What test should be used?

Accepted Answer

Matched-Pairs T Test for a Mean

Answer

One-Sample T Test for a Mean

Answer

Two-Sample T Test for the Difference in Means

Question 36

Dannon is supposed to put 29.6 grams of fruit in their fruit-flavored yogurt. To see if enough fruit is being placed in cups of fruit-flavored yogurt, a quality inspector measured the amount in 27 containers.She found an average of 28.9 grams of fruit and standard deviation of 2.8 grams. Does this show that there is probably enough yogurt in the cups? What test should be used?

Accepted Answer

One-Sample T Test for a Mean

Answer

One-Sample Z Test for a Proportion

Answer

Matched-Pairs T Test for a Mean

Answer

Chi-Square Goodness of Fit Test

Question 37

What does it mean when a test is statistically significant?

Accepted Answer

the test statistic had a P-value lower than the alpha level

Answer

it has reached alpha level status

Answer

the test statistic had a P-value higher than the alpha level

Answer

it is important in practical terms

Question 38

How can you reduce both Type I and Type II errors?

Accepted Answer

increase the sample size

Answer

it can't be reduced

Answer

redo the tests

Answer

tamper with the data

AP Statistics Course Check #1

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