A survey conducted during May 20 - 22, 2005, asked 1006 Americans, "During the past
year, about how many book, either hardcover or paperback, did you read either all or part of the way through?" Results of the survey indicated that the mean of the sample was 13.4 books with a standard deviation of 16.6 books. Construct a 99% confidence interval for the mean number of books Americans read either all or part of during the past year.
This solution gives the step by step method for computing confidence interval for mean.