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