You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately 0' =
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately 0' = 31.5. You would like to be 913% confident that your estimate is within 3 of the true population mean. How large of a sample size is required? Do not round mid-calculation
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