Suppose you wish to estimate a population mean based on a random sample of n observations, and prior experience suggests

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answerhappygod
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Suppose you wish to estimate a population mean based on a random sample of n observations, and prior experience suggests

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Suppose you wish to estimate a population mean based on a random
sample of n observations, and prior experience suggests that 
=13.2. If you wish to estimate  correctly to within 1.8, with a
probability equal to 0.95, how many observations should be included
in your sample?
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