he statistics course in the Business School was taught by a faculty for many years. The course had mean ratings of 3.8 with a standard deviation of 0.5. After her retirement, the course was taught by a new faculty. The average ratings of the course taught by the new faculty was 3.65 from a class of 25 students. Should the head of the department be worried? Is the average rating of the course taught by the new faculty significantly lower than the mean rating of the retired faculty. (One tailed hypothesis test, set = 0.05)