If you want to be 95% confident of estimating the population proportion to within a sampling error

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If you want to be 95% confident of estimating the population proportion to within a sampling error of ±0.02 and there is historical evidence that the population proportion is approximately 0.40, what sample size is needed?
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Statistics For Managers Using Microsoft Excel

ISBN: 9780133130805

7th Edition

Authors: David M. Levine, David F. Stephan, Kathryn A. Szabat

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