Question: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately a

on previous evidence, researchers believe the population standard deviation is approximately a

We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately a = 61.8. We would like to be 90% confident that the estimate is within 1 of the true population mean. How large of a sample size is required? n

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