AP Statistics review (chapters 1-4)

Question 1

Would it be appropriate to split the stems in this stem plot?

Accepted Answer

Yes

Question 2

In an experiment, why is it beneficial to increase the number of experimental units?

Accepted Answer

This will decrease the sampling distribution's variation

Question 3

Using the two-way table below, calculate the marginal distributon of sports cars.

Accepted Answer

35%

Question 4

Which of the following is NOT a fact about "r"?

Accepted Answer

Has units of measure

Question 5

Which one the following is NOT a good way to sample?

Accepted Answer

Convenience Sampling

Question 6

Which of the following is the "equal-areas" point of any density curve?

Accepted Answer

Median

Question 7

Which of the following is the "balancing point" of any density curve?

Accepted Answer

Mean

Question 8

If a group of people are randomly selected for a study but not randomly assigned to treatments,

Accepted Answer

we can make inferences to pop but NOT determine casue/effect

Question 9

How do you calculate a Z-score?

Accepted Answer

(x-µ)/σ

Question 10

Which way is this histogram skewed?

Accepted Answer

Skewed Right

Question 11

Using the data table below calculate the conditional distribution of Female for SUV's.

Accepted Answer

86.5%

Question 12

What percent of the standard normal curve has z-scores less than 2.0?

Accepted Answer

97.5%

Question 13

Does an association between two variables imply causation?

Accepted Answer

No

Question 14

What happens when you increase the standard deviation of a normal distribution?

Accepted Answer

The "bell" gets shorter

Question 15

To the nearest percent, what proportion of dogs (see graph) weigh between 49 and 59 lbs?

Accepted Answer

85%

Question 16

Which experimental design best applies to the following? Difference in pulse rates (stand/sit)

Accepted Answer

matched pairs

Question 17

What are the IQRs of the groups based on the summary below?

Accepted Answer

Males= 247 and Females= 940

Question 18

Based on the graph below, the r-value is most likely;

Accepted Answer

Strong and Positive

Question 19

See question below:

Accepted Answer

I, II, III, and IV

Questions 19