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August 31, 2015

Homework Help: Math

Posted by Cassandra on Tuesday, May 1, 2012 at 12:57am.

The Pew Research Center recently polled n= 1048 U.S drivers andfound 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, 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.

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