6. (20%) Let X1,X2,...，X25 be a random sample of size n = 25 from N(μ 100). To test H0 : μ=80 against H1：μ＞ 80. Let the critical region be defined by C = , where x is the sample mean.
申論題內容
a) Find the power function of this test and the power at θ = 85.
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, where x is the sample mean.