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We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximate = 63.6
We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximate = 63.6
.We would like to be 90% confident that the estimate is within 2.5 of the true population mean. How large of sample size is required?
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