Asked by EEL

At a certain university, the average cost of books was $370 per student last semester and the population standard deviation was $80. This semester a sample of 45 students revealed an average cost of books of $390 per student. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?

Answers

Answered by PsyDAG
Ho: mean = 370

Ha: mean > 370

Z = (score-mean)/SEm = ?

SEm = SD/√n
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