Scores on a certain IQ test are known to have a mean of 100. A random sample of 60 students attend a series of coaching classes before taking the test. Let u be the population mean IQ score that would occur if every student took the coaching classes. The classes are successful if M > 100. A test is made of the hypotheses Ho: M = 100 versus Hi:M > 100. Consider three possible conclusions: (i) The classes are successful. (in) The classes are not successful. (ini) The classes might not be successful.

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