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How many weeks of data must be randomly sampled to estimate the mean weekly sales...

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How many weeks of data must be randomly sampled to estimate the mean weekly sales of a new line of athletic footwear We want 90 confidence that the sample mean is within 400 of the population mean and the population standard deviation is known to be 1 200 1 645 1200 2 400 n n 24 4 n 25 weeks

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