Donald Heel is the Microwave Oven Division Manager of Sharp Products. Don proposes a $40 cash rebate program as a means of promoting Sharp’s new crisp-broil-and-grill microwave oven. However, Sharp’s president wants evidence that the program would increase sales by at least 25%, so Don applies some of his research budget to a survey. He uses National Phone Systems Company to conduct a nationwide survey using random digit dialing. National Phone Systems is a fully integrated telephone polling company, and it has the capability of providing daily tabulations. Don decides to use this option, and instead of specifying a final sample size, he chooses to have National Phone Systems perform 50 completions each day. At the end of five days of field work, the daily results are as follows:
For how much longer should Don continue the survey? Indicate your rationale.

  • CreatedAugust 06, 2015
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