Question

Professors Michael Halbert and Dwight Scott predict that the older employees at the paper manufacturing and distrubution company, Munder Difflin will use more paper over the course of a year than the average employee. They know on average, employees at Munder Difflin go through 4.35 cases of paper/year. How many tails is Halbert and Scott's t-test?

Answer 1

They are using a one tail t test. (Right Tailed)

This can be inferred from the fact which states that Halbert and Scott predict that the employees will use more paper over the course of the year. This indicates a greater than value or it is giving a direction.

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IF it had mentioned that the employees would use less paper paper over the course of the year, this would indicate a lesser than value. Again it is giving a direction. This is again a one tailed (Left tailed)

IF it had mentioned that the employees would use an amount of paper of a different amount over the course of the year, this would indicate a not equal to value. Here there is no specified direction.. This is a two tailed test.

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