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You want to obtain a sample to estimate a population mean. Based on previous evidence, you...

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ = 61.7 . You would like to be 95% confident that your estimate is within 4 of the true population mean. How large of a sample size is required?
Use a z* value accurate to TWO places for this problem. (Not z = 2)

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To find sample size (n) such that

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