Apoll conducted in 1970 asked 1004 people, "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 overbarequals18.9 books and sequals19.9 books. (a) construct a 99% confidence interval for the mean number of books read either all or part of during the preceding year. interpret the interval. (b) compare these results to a recent survey of 1004 people. the results of the survey indicated that x overbarequals12.6 books and sequals15.7 books. a 99% confidence interval for this survey is (11.32 comma 13.88 ). were people reading more in 1970 than they are today?