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OpenStudy (ebarnet7):
The advertising department of a nationally circulated magazine wishes to estimate the mean age of its subscribers to within 1/2 year with 90% confidence. If they estimate that the standard deviation of the ages of their subscribers is about 5 years, what is the minimum size of the sample they must take? A. 17 B. 165 C. 45 D. 271 E. 13
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