3. (6 pts) A school administrator wants to conduct a poll to estimate the percentage of full-time college students who have credit card debt of $2000 of more. What sample size should be obtained if she wants the estimate to be within 2.5 percentage points with 94% confidence using a pilot study estimate of 34%? 4. (6 pts) A recent Gallup poll asked 1006 Americans, "During the past year, about how many books, either hardcover or paperback, did you read either all or part of the way through?" Results of the survey indicated that x = 13.4 books and s = 16.6 books. Construct a 99% confidence interval for the mean number of books that Americans read either all or part of during the preceding year. Interpret the interval