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The z statistic is z= x - 280/(50/sqrt800)

A. What is the rule for rejecting Ho in terms of z?

B. What is the rule for rejecting Ho restated in terms of the sample mean?

C. You want to know whether this test will usually reject Ho when the true population mean is 275, 5 points lower than the null hypothesis claims. Answer this question by calculating the power when u=275.