In a Time Magazine/Aspen poll of American adults conducted by the strategic research firm Penn Schoen Berland, these adults were asked, “In your opinion, what is more important for the U.S. to focus on in the next decade?” Eighty-three percent of the adults polled said domestic issues (Time, July 11, 2011). Suppose that this poll was based on a random sample of 1000 American adults.
a. What is the value of the point estimate of the corresponding population proportion?
b. Construct a 99% confidence interval for the proportion of all American adults who will say domestic issues in response to the aforementioned question.