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Suppose it is desired to test the hypothesis that the mean score of students on a national examination is 500 against the alternative hypothesis that
Suppose it is desired to test the hypothesis that the mean score of students on a national examination is 500 against the alternative hypothesis that it is less than 500. A random sample of 15 students is taken from the population and produces a sample mean score of 475 and a sample standard deviation of 35. Assume the population of test scores is normally distributed. State the decision rule, the test statistic, and your decision.
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