A sample of n = 25 individuals is selected from a population with m = 80 and a treatment is administered to the sample. What is expected if the treatment has no effect?   a The sample mean should be very different from 80 and should lead you to reject the null hypothesis.   b The sample mean should be very different from 80 and should lead you to fail to reject the null hypothesis.   c The sample mean should be close to 80 and should lead you to reject the null hypothesis.   d The sample mean should be close 80 and should lead you to fail to reject the null hypothesis

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