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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=28.5σ=28.5. You would like to be 99% confident that your estimate is within 1.5 of the true population mean. How large of a sample size is required?

n = ????

Math   Statistics-And-Probability   
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TOPIC:Finding the required sample size for the given confidence level and the allowable margin of error.

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