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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 a =

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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 a" = 31.8. You would like to be 9396 confident that your estimate is within 3 of the true population mean. How large of a sample size is required? Do not round mid-oaloulation. "=| | Question Help: E Message instructor Submit

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