Chapter 11 AP Statistics

• 0.90

• 0.40

• 0.05

• 0.20

• 0.10

Conference organizers wondered whether posting a sign that says "Please take only one cookie" would reduce the proportion of conference attendees who take multiple cookies from the snack table during a break. To find out the organizers randomly assigned 212 attendees to take their break in a room where the snack table had a sign posted, and 189 attendees were assigned to a room where the snack table did not have a sign posted. In the room without a sign posted, 24.3% of attendees took multiple cookies. In the room with the sign posted, 17% of attendees took multiple cookies. Is this decrease in proportions statistically significant at the 5% level?

• No, the P-value is 0.034

• No, the P-value is 0.068

• Yes, the P-value is 0.034

• Yes, The P-value si 0.068

• Cannot be determined from the information given.

What is the critical z-score for a 94% confidence interval?

• 2.57

• 2.33

• 1.95

• 1.88

• 1.75

• A
• B
• C
• D

• B
• C
• D
• E

• A
• B
• C
• D

• B
• C
• D
• E

• I
• II
• III
• I, II, and III

• More females use social networking sites.
• In general, females use the sites more often than males.
• Approximately the same number of males and females were surveyed.
• About 43% of all students surveyed said they used social networking sites on a weekly basis.

• 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.