5. (20%) Let X be a random variable with mean /.i and finite varianceσ2. Wc want to test the hypotheses, where /iq is specified. Let X1, • • •, Xn be a random sample from the distribution of X and denote the sample mean and variance by and S2respectively.
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(b) Find the approximate power function of the test.
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, where /iq is specified. Let X1, • • •, Xn be a random sample from the distribution of X and denote the sample mean and variance by 
and S2respectively.