Getting angry at other drivers. Refer to given Exercise. The same Pew Poll found that 38% of the respondents "shouted, cursed or made gestures to other drivers" in the last year.
(a) Construct a 95% confidence interval for the true proportion of U.S. drivers who did these actions in the last year.
(b) Does the fact that the respondent is self-reporting these actions affect the way that you interpret the results? Write a short paragraph explaining your answer.
Exercise
Do you enjoy driving your car? The Pew Research Center polled n = 1048 U.S. drivers and found that 69% enjoyed driving their automobiles.
(a) Construct a 95% confidence interval for the proportion of U.S. drivers who enjoy driving their automobiles.
(b) In 1991, a Gallup Poll reported this percent to be 79%. Using the data from this poll, test the claim that the percent of drivers who enjoy driving their cars has declined since 1991. Report the large-sample z statistic and its P-value.