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How many students must be randomly selected to estimate the mean weekly eamings of students...

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How many students must be randomly selected to estimate the mean weekly eamings of students at one college We want 95 confidence that the sample mean is within 4 of the population mean and the population standard deviation is known to be 90 OA 1 945 B 1 370 C 1 714 D 2 748 um sample size required to estimate an unknown population mea HARI www

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