The Pew Research Center recently polled n= 1048 U.S drivers andfound that 69% enjoyed driving their automobiles.

Question

(a) Construct a 95% confidence interval for the proportion of U.S.drivers who enjoy driving their automobiles.
(b) In 1991, Gallup Poll reported this percent to be 79%. Using thedata from this poll, test the claim that the percent of drivers whoenjoy driving their cars has declined since 1991. Report thelarge-sample z statistic and its P-value.

Answer 1

(a) 95% confidence interval: (0.65, 0.73)

(b) Large-sample z statistic: -2.45
P-value: 0.014