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OpenStudy (anonymous):
An airline is interested in determining the proportion of its customers who are flying for reasons of business. If the airline wants to be 90% confident that its estimate will be correct to within 2 percent (that is, the margin of error is 2%), how large a random sample should it select? Would someone please give me a hand with this problem? Been looking through my notes, but can not find a problem like this one.
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