1.Will the power of a hypothesis test (for single population mean) increase or decrease when (1) a(阿罰)increases (increase) (2) the population standard deviation increases (decrease) (3) sample size n increases (increase) There are several ways to increase power: 1.Increase the sample size. 2.Decrease the variation, which essentially has the same effect as increasing the sample size. You have a better chance of distinguishing mu ( ). Be very cautious in your measurement process and you may want to limit your population so that it is more homogenous. 3.Increase the alpha level. You will have more of a chance of rejecting the alternative at the 5% level of significance than a 1% test, because the strength of evidence required is less. 4.Consider an alternative that is farther away from the null hypothesis. Values of the population mean that are in the alternative but are close to the hypothesized value are harder to detect (lower power) than values of the population mean that are father from the hypothesized population mean. 之前作這一題是參考這個的說明 出處http://www.yale.edu/soc119a/lecture7.htm 有錯誤麻煩請指正~ --

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