On average, libraries across the U.S. check out 300 books per day, with a standard deviation of 38. Due to the rise in the popularity of audiobooks and e-readers, a group of researchers believes that the mean is most likely lower than the claimed value. They randomly sample 400 libraries and find a sample mean of 280 books with a standard deviation of 9. Conduct a z-test at a = 0.01 to determine if there is evidence to conclude that the mean number of books checked out each day is less than 300. Report your results in APA format. 1) State Hypotheses 2) Determine Critical Values 3) Calculate the Test Statistic 4) Compare and Decide