Constructing a Confidence Interval for population proportion p 1. The graph shown below is from a survey of 498 U.S. adults. Construct a 99% confidence interval for the population proportion of U.S. adults who think that teenagers are the more dangerous drivers Who are the more dangerous drivers? 71% Teenagers 25% 4% No opinion a. Find p and a b. Verify that the sampling distribution of can be approximated by a normal distribution c. Find zc and margin of error (E). d. Use P and E to find the left and right endpoints of the confidence interval. e. Interpret the results.
