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?

asked by EEL

9 years ago

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1 answer

Ho: mean = 370

Ha: mean > 370

Z = (score-mean)/SEm = ?

SEm = SD/√n

answered by PsyDAG

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Question

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?

1 answer

Ho: mean = 370

Ha: mean > 370

Z = (score-mean)/SEm = ?

SEm = SD/√n

PsyDAG · Answer

Ho: mean = 370 Ha: mean > 370 Z = (score-mean)/SEm = ? SEm = SD/√n