The librarian at the local school claims that, on average, the books in the library are more than 20 years
old. To test this claim, a student takes a sample of 30 books, and records the publication date. The sample of
30 books produce an average age of M = 23.86 years with a standard deviation of 8.82 years. Conduct a one-
tailed test with α = .01 to determine whether the average age of the library books is significantly greater than
20 years