Why do we do power calculations with single sample z test?, Ask an Expert

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Why do we do power calculations with single sample z test?

A) Because we can use Z area tables to calculate the power.

B) Because comparing a sample mean against a population mean is very powerful

C) Three of the other answers

D) Two of the other answers

E) If the standard deviation had to be estimated from the sample, the calculations would involve t distributions, which vary by sample size.

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