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Do students who are members of fraternities or sororities have GPAs different from the student body as a whole? A random sample of 123 Greeks

Do students who are members of fraternities or sororities have GPAs different from the student body as a whole? A random sample of 123 "Greeks" has been selected from the student body of a large university. The GPA for the student body as a whole is 2.59 and the mean for the sample is 2.47 with a standard deviation of 0.34. Is the difference statistically significant?

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