In each of Exercises, use the two-proportions plusfour z-interval procedure to find the required confidence interval. Interpret your results. Confidence in Banks. Since 1973, Gallup has asked...

In each of Exercises, use the two-proportions plusfour z-interval procedure to find the required confidence interval. Interpret your results.

Confidence in Banks.
Since 1973, Gallup has asked Americans how much confidence they have in a variety of U.S. institutions. One question asked of those polled is whether they have a great deal of confidence in banks. In 2007, of a random sample of 1008 adult Americans, 413 said yes; and, in 2013, of a random sample of 1529 adult Americans, 398 said yes. For the two years, nd and interpret a 95% confidence interval for the difference between the percentages of adult Americans who had a great deal of confidence in banks.