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Hypothesis testing for single proportion.

In an early study, researchers at an Ivy University found that 33 percent of the freshmen had received at least one A in their first semester. Administrators are concerned that grade inflation has caused this percentage to increase. In a more recent study, of a random sample of 500 freshmen, 185 had at least one A in their first semester work out the appropriate test statistic to test the hypotheses related to the concern and test at 5 percent and 1 percent.

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