IQ: Scores on a certain IQ test are known to have a mean of
. A random sample of
students attend a series of coaching classes before taking the test. Let
be the population mean IQ score that would occur if every student took the coaching classes. The classes are successful if
. A test is made of the hypotheses
versus
. Consider three possible conclusions: (i) The classes are successful. (ii) The classes are not successful. (iii) The classes might not be successful.
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Which of the three conclusions is best if
is not rejected?
The best conclusion is
.