1. A prospective author of an introductory level statistics book is interested in the number of pages in introductory level statistics books. A random sample of n = 15 introductory level statistics books is selected yielding a sample average of 972 pages with a sample standard deviation of 85 pages. Suppose the number of pages in an introductory level statistics book is normally distributed. (a) Calculate a 99% confidence interval for the mean number of pages in an introductory