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For a Work-Sampling Study, There Is a 95 Percent Probability

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For a work-sampling study, there is a 95 percent probability that the processing time of an activity has an error of less than 0.06 minutes. The best estimate we have for "p" is 0.30. Determine the sample size needed for a work-sampling study if no estimate of "p" is available.

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n ≥ (Zα/2)2 p ...

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