The Director of the Human Resources Department for a large chainstore retailer i

Question

The Director of the Human Resources Department for a large chainstore retailer is presenting the
results of a survey of employee morale. Her talk begins asfollows:
Findings were based on interviews with 200 employees. We took asimple random sample of 50 stores
and interviewed 4 employees per store. Interviews were conducted bytrained psychologists. Since the
interviews were anonymous, we do not know the name of theinterviewed subjects....
At this point in the talk, assuming you are interested in the truelevel of employee morale, you should want to
interrupt the speaker to ask a very important question. What isthat question and why is it important?

Explanation / Answer

At this point in the discussion, the most important question is "are each of the 4 employees interviewed at each store equallylikely to be interviewed?" For a simple random sample, eachpossible person at the store has to have an equally likely chanceof getting interviewed. Otherwise, if you only interviewedupper-management, the results might be different than if you onlyinterviewed stockers who do manual labor. The purpose behind thesekinds of sampling techniques is to prevent skewed data.

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