AP Statistics Exam Review

• The slope decreased and the r² increased.
• The slope increased and the r² decreased.
• The slope decreased but r² remained the same.
• Both slope and r² remained the same.

• A
• B
• C
• D

• A
• B
• C
• D

• B
• C
• D
• E

• B
• C
• D
• E

A small town employs 34 salaried, nonunion employees. Each employee receives an annual salary increase between $500 and $2000 based on a performance review by the mayor's staff. Some employees are members of the mayor's political party, and the rest are not.

Students at the local high school form two lists, A and B, one for the raises granted to employees who are in the mayor's party, and the other for raises granted to employees who are not. They want to display a graph (or graphs) of the salary increases in the student newspaper that readers can use to judge whether the two groups of employees have been treated in a reasonably equitable manner.

Which of the following displays is LEAST likely to be useful to readers for this purpose?

• Back-to-back stemplots of A and B

• Scatterplot of B versus A

• Parallel boxplots of A and B

• Histograms of A and B that are drawn to the same scale

• Dotplots of A and B that are drawn to the same scale.

17% of people in the United States have blue eyes. What is the probability of randomly selecting 5 people and getting at least one with blue eyes?

• 0.17

• 0.39

• 0.40

• 0.61

• 0.83

The number of sweatshirts a vendor sells daily has the following probability distribution. If each sweatshirt sells for $25, what is the expected daily total dollar amount taken in by the vendor from the sale of sweatshirts?

• $5.00

• $7.60

• $35.50

• $38.00

• $75.00

A high school statistics class wants to conduct a survey to determine what percentage of students in the school would be willing to pay a fee for participating in after-school activities. 20 students are randomly selected from each of the freshman, sophomore, junior, and senior classes to complete the survey. This plan is an example of which type of sampling?

• Cluster

• Convenience

• Simple Random

• Stratified Random

• Systematic

The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

• 28,000 km and 32,000 km.

• 24,000 km and 34,000 km.

• 26,000 km and 34,000 km.

• 27,000 km and 31,000 km.