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April 20, 2014

Homework Help: Statistics

Posted by Michael on Friday, May 25, 2012 at 10:25am.

A number of cashiers at a chain of grocery stores complained about the working conditions (shift length, design of cash registers, etc.), claiming that they resulted in back pain in at least 80 percent of cashiers. The employer, trying to show that that claim is not true, carries out a study involving 135 cashiers. It showed that 102 of them did indeed experience back pain that was due to the working conditions.

Part (a)
Is the sample data consistent with the cahiers’ claim? Please answer “yes” or “no” and provide a brief explanation.

Part (b)
Using a significance level of 0.05, can we reject the cashiers’ claim? Please make sure to show your work!

Part (c)
Look at the answers to Parts (a) and (b). At first glance, they may seem contradictory. Explain how that seeming contradiction can be resolved in the context of hypothesis testing.

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