SOLUTION: At a certain university, the average cost of books per student was $330 per student last semester. In a sample of 50 students this semester, their average cost was $355 with a stan

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Question 273221: At a certain university, the average cost of books per student was $330 per student last semester. In a sample of 50 students this semester, their average cost was $355 with a standard deviation of $85. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
At a certain university, the average cost of books per student was $330 per student last semester.
In a sample of 50 students this semester, their average cost was $355 with a standard deviation of $85.
The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
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test stat
t(355) = (355-330)/[85/sqrt(50)] = 2.0797..
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Cheers,
Stan H.