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Your professor is interested in learning if retaking an exam after attending office hours and studying influences grades. He decides to compare 16 student's 1st

Your professor is interested in learning if retaking an exam after attending office hours and studying influences grades. He decides to compare 16 student's 1st exam scores versus their retake scores. There was a sample mean difference of +6 and a standard deviation of 4. State the null and alternative hypothesis. What T crit score should be used? Why

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