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A group of college students believes the average grades in psychology courses are different than the average grades in biology courses. The group found the

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A group of college students believes the average grades in psychology courses are different than the average grades in biology courses. The group found the average psychology grades of a sample of 18 students was 82.5 and the average biology grades of a different sample of 21 students was 81.8. What is the null hypothesis of this study

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