There are 150 books in a professor's office. You take a random sample of 8 of these books and count the number of pages in them. The data follow: 192 345 97 224 219 304 147 284
a.) Construct a 90% confidence interval for the mean number of pages in the books in this professor's office.
b.) Construct a 90% confidence interval for the total number of pages in all of the professor's books, combined.
c.) What do you need to assume in order to construct the intervals above?