How large of a sample is needed to estimate the mean of a


Please show me how to solve this sample question: How large of a sample is needed to estimate the mean of a normally distributed population of each of the? following?

ME = 7?; σ= 31?; α =0.10

ME =14?; σ =31?; α =0.10

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Basic Statistics: How large of a sample is needed to estimate the mean of a
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