4 Chapter 7 Test B 16. [Objective: Calculate and interpret confidence intervals for a proportion) A random sample of 950 adult television viewers showed that 48% planned to watch sporting event X...
4 Chapter 7 Test B 16. [Objective: Calculate and interpret confidence intervals for a proportion) A random sample of 950 adult television viewers showed that 48% planned to watch sporting event X. The margin of error is 4 percentage points with a 95% confidence level. Does the confidence interval support the claim that the majority of adult television viewers plan to watch sporting event X? No; the confidence interval means that we are 95% confident that the population proportion of adult television viewers who plan to watch sporting eventX is between 46% and 50%. Yes; the confidence interval means that we are 95% confident that the population proportion of adult television viewers who plan to watch sporting event X is between 44% and 52% a, b which includes 50%. c. Yes; the confidence interval means that we are 95% confident that the population proportion of adult television viewers who plan to watch sporting event X is between 46% and 50%. d. None of the statements are accurate 17. [Objective: Calculate and interpret confidence intervals for a proportion] Suppose that in a recent poll of 900 adults between the ages of 35 and 45, 22% surveyed said they have thought about participating in an extreme sport such as bungee jumping. Find the 95% confidence interval for the 35 to 45 who have thought about participating in an extreme sport such as bungee jumping then choose the correct interpretation. (Round to the nearest tenth of a percent) proportion of adults ages a. The population proportion of adults ages 35 to 45 who have thought about participating in an extreme sport is between 13.9% and 30.1%, with a confidence level of 95%. b There is a 95%chance that the population of adults ages 35 to 45 who have thought about participating in an extreme sport is between 13.9% and 30.1%. c- There is a 95% chance that the population of adults ages 35 to 45 who have thought about participating in an extreme is between 19.3% and 24.7%. d. The population proportion of adults ages 35 to 45 who have thought about participating in an extreme sport is between 19.3% and 24.7%, with a confidence level of 95% Section 7.5 (Comparing Two Population Proportions with Confidence) 18. [Objective: Interpreting Confidence Intervals for Two Proportions] Confidence intervals can be used to determine whether different sample proportions reflect a "real" difference in the population. The basic approach is to a. find the margin of error for each proportion and see if the difference is less than zero. b. find the difference in the proportions and see if the difference is less than zero. c. find a confidence interval at the significance level desired for the difference in proportions. d. find the difference in the proportions and see if the difference is greater than zero. 19. IObjective: Interpreting Confidence Intervals for Two Proportions] A polling agency wants to estimate the proportion of U.S. citizens who support the president's domestic policies. They surveyed 2500 U.S. citizens and found a 95% confidence interval for the difference in proportions between men and women who support the president's domestic policies as (-0.025 to 0.050) where population 1 is men and population 2 is women. Select the correct interpretation of this result The interval contains zero which shows that women are more likely than men to disagree with the president's foreign policies. b. a. The intervál contains zero which shows that men are more likely than women to disagree with the president's foreign policies The interval does not contain zero which shows that there is no significant difference in the proportions between men and women. d. c. The interval contains zero which shows that there is no significant difference in the proportions between men and women. Copyright O 2017 Pearson Education, Inc.
4 Chapter 7 Test B 16. [Objective: Calculate and interpret confidence intervals for a proportion) A random sample of 950 adult television viewers showed that 48% planned to watch sporting event X. The margin of error is 4 percentage points with a 95% confidence level. Does the confidence interval support the claim that the majority of adult television viewers plan to watch sporting event X? No; the confidence interval means that we are 95% confident that the population proportion of adult television viewers who plan to watch sporting eventX is between 46% and 50%. Yes; the confidence interval means that we are 95% confident that the population proportion of adult television viewers who plan to watch sporting event X is between 44% and 52% a, b which includes 50%. c. Yes; the confidence interval means that we are 95% confident that the population proportion of adult television viewers who plan to watch sporting event X is between 46% and 50%. d. None of the statements are accurate 17. [Objective: Calculate and interpret confidence intervals for a proportion] Suppose that in a recent poll of 900 adults between the ages of 35 and 45, 22% surveyed said they have thought about participating in an extreme sport such as bungee jumping. Find the 95% confidence interval for the 35 to 45 who have thought about participating in an extreme sport such as bungee jumping then choose the correct interpretation. (Round to the nearest tenth of a percent) proportion of adults ages a. The population proportion of adults ages 35 to 45 who have thought about participating in an extreme sport is between 13.9% and 30.1%, with a confidence level of 95%. b There is a 95%chance that the population of adults ages 35 to 45 who have thought about participating in an extreme sport is between 13.9% and 30.1%. c- There is a 95% chance that the population of adults ages 35 to 45 who have thought about participating in an extreme is between 19.3% and 24.7%. d. The population proportion of adults ages 35 to 45 who have thought about participating in an extreme sport is between 19.3% and 24.7%, with a confidence level of 95% Section 7.5 (Comparing Two Population Proportions with Confidence) 18. [Objective: Interpreting Confidence Intervals for Two Proportions] Confidence intervals can be used to determine whether different sample proportions reflect a "real" difference in the population. The basic approach is to a. find the margin of error for each proportion and see if the difference is less than zero. b. find the difference in the proportions and see if the difference is less than zero. c. find a confidence interval at the significance level desired for the difference in proportions. d. find the difference in the proportions and see if the difference is greater than zero. 19. IObjective: Interpreting Confidence Intervals for Two Proportions] A polling agency wants to estimate the proportion of U.S. citizens who support the president's domestic policies. They surveyed 2500 U.S. citizens and found a 95% confidence interval for the difference in proportions between men and women who support the president's domestic policies as (-0.025 to 0.050) where population 1 is men and population 2 is women. Select the correct interpretation of this result The interval contains zero which shows that women are more likely than men to disagree with the president's foreign policies. b. a. The intervál contains zero which shows that men are more likely than women to disagree with the president's foreign policies The interval does not contain zero which shows that there is no significant difference in the proportions between men and women. d. c. The interval contains zero which shows that there is no significant difference in the proportions between men and women. Copyright O 2017 Pearson Education, Inc.
