Question: The director of admissions at the University of Maryland, University College is concerned about the high cost of textbooks for the students each semester. A sample of 20 students enrolled in the university indicates that X (bar) = $315.4 and s = $43.20.

(a) Test the claim of the director

(b) What is your answer in (b) if s = $75 and the 0.05 level of significance is used?

(c) What is your answer in (c) if X (bar) = $305 and s = 43.20?

(d) Based on the information in part (d), what decision should the director make about the books used for the courses if the goal is to keep the cost below $300?