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The personnel department of a large government agency needs to know the percentage of employees who will retire this year. This information is essential to

The personnel department of a large government agency needs to know the percentage of employees who will retire this year. This information is essential to agency recruitment personnel. The agency determines this information with a random sample. If the agency wants to be 90% sure that its estimate of the retirement percentage is within 2%, how large a sample should it take?

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