Apoll conducted in 1975 asked 1008 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 19.2 books and s 20.2 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 1008 people. the results of the survey indicated that x 13.2 books and s-16.3 books. a 99% confidence interval for this survey is (11.88, 14.52). were people reading more in 1975 than they are today?
(1) the 99% confidence interval for 1975 is (「id. (use ascending order. round to two decimal places as needed.) interpret the confidence interval. which of the following is correct?
a. we are 99% confident that the mean number of books read in 1975 is not
b. the probability that the interval does not contain the mean number of
c. we are 99% confident that the mean number of books read in 1975 is in
d. the probability that the interval contains the mean number of books read
(2) were people reading more in 1975 than they are today?
a. people were reading approximately the same number of books in 1975 as they are today in the interval. books read is 99%. the interval, is 99%.
b. no, people were reading less in 1975 than they are reading today.
c. yes, people were reading more in 1975 than they are reading today.