1. Using the z-table (Table E), find the critical value (or values) for a a = .14 right-tailed test.

1. 0.1406

2. 1.08

3. 0.0557

4. 1.54

2. At a certain university, the average cost of books per student was $400 per student last semester. In a sample of 40 students this semester, their average cost was $430 with a standard deviation of $80. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?

a. 15.00

b. 2.37

c. 0.38

d. 0.75