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You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o =

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You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 38.4. You would like to be 95% confident that your estimate is within 2 of the true population mean. How large of a sample size is required? 1 =

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