11) (10 pts) A group of statistics students wishes to test the bookstore's claim that the mean cost of a textbook is at most $60. A sample of 100 textbooks is selected and the sample mean is found to be $61.50. Assume that the population standard deviation o is $5.00. a) Identify Ho and Ha using math symbols. (2) Ho Ha b) Calculate the test statistic. ( 2 ) c) Find the p-value. (2) d) State the decision and conclusion regarding the Null Hypothesis if a = 0.05. (4)