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At a certain university, the average cost of books was $330 per student last semester and the population standard deviation was $75. This semester a sample of 50 students revealed an average cost of books of 4365 per student. The dean of students believes that teh costs are greater this semester. What is the test value for this hypothesis?

a) 0.47

b) 0.70

c) 3.30

d) 23.33

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