Question

6. The Gallup Poll regularly asks the following question of a random sample of Americans, "Do you approve or disapprove of the way the president is handling his or her job as president?" In June 2007, 32% of respondents in a randon sample of 1,007 said that they approve of George W. Bush's performance in June 2008, 28% ofrespondents in an independent random sample of 1,625 Americans said they approve of President Bush. [12 points] a. Does the change between June 2007 and June 2008 represent a statistically significant decrease in President Bush's approval rating? Conduct an appropriate hypothesis test using a 0.05. [5 points] b. What kind of decision error might you have made in part (a)? [2 points] c. Construct an 80% confidence interval for the June 2007 to June 2008 change in President Bush's job approval rating. [4 points)

Answer 1

200 270-. 16.2.5 1625 07 :307 42 202 Tor 시다 2.5-0.32- 62.5....109T2....

A. スー-2.16 Ho e a madle nt--n -0.064-