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SAT, 05.12.2019 23:31 boogerbuttday
30 students take a pre-test for their knowledge of statistics on the first day of class for the semester. their mean score was 40% correct (s = 5.00). then on the comprehensive final exam you note that their mean score was 70% correct (s = 6.00). the standard deviation of the difference between the 2 means (40 vs. 70) is 4.00.
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