A friend of yours has just completed a one-group pretest-posttest experiment. (Refer back to Chapter 7 if

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A friend of yours has just completed a one-group pretest-posttest experiment. (Refer back to Chapter 7 if you need to refresh your memory on the types of experimental designs.) He told you that he plans to assess the reliability of the key dependent measure using the test-retest method, since he was able to collect interval-level data for the measure using the same sample at two different points in time.

Would you recommend that he follow through with this plan? Why or why not? If not, how would you suggest he evaluate the reliability of his key dependent variable? Justify your decision.

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