Before installing a high-tech laser exhibit near the exit area, a museum of Amer

Question

Before installing a high-tech laser exhibit near the exit area, a museum of American technology found the average contribution by patrons was $2.75 per person. For a sample of 30 patrons following installation of the new exhibit, the contributions are as listed in data file XR10108. Based on the sample data, and using the 0.025 level of significance, can we conclude that the new exhibit has increased the average contribution of exhibit patrons? Identify and interpret the p-value for the test. (I just would like to know if I have to use Z-Test or Z-test?) one tail or two tail?

Explanation / Answer

We have to use t-test as the population S.D is unknown.

It is one-tailed (right) test as the claim to be tested is population mean is increased or not.

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