5.12. In the 2006 GSS, respondents were asked whether they favored or opposed the death penalty for people convicted of murder. Software shows results:

x n Sample prop 95.0% CI 1885 2815 0.6696 (0.652, 0.687)

Here, x refers to the number of the respondents who were in favor.

(a) Show how to obtain the value reported under

"Sample prop."

(b) Can you conclude that more than half of all American adults are in favor? Why?

(c) Find a 95% confidence interval for the proportion of American adults who opposed the death penalty from the confidence interval shown for the proportion in favor.