Multiple choice problems based on the test for population mean.
1. Using z-table (Table E), find the critical value (or values) for a a = .14 right-tailed test.
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?