Using the data provided in problem 14-49, test the null hypothesis that returns on the investment are normally distributed, but with unknown mean and standard deviation. That is, test only for the validity of the normal-distribution assumption. How is this test different from the one in problem 14-49?

8, 9, 9.5, 9.5, 8.6, 13, 14.5, 12, 12.4, 19, 9, 10, 10, 11.7, 15, 10.1, 12.7, 17, 8, 9.9, 11, 12.5, 12.8, 10.6, 8.8, 9.4, 10, 12.3, 12.9, 7