題組內容

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.

a) Find the power function of this test and the power at θ = 85.