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A professor gives an exam for which there are two versions, A and B. Each student in the class is given one randomly selected version of the exam. After the exam, the professor wishes to determine if there is a difference in the level of difficulty of the two versions by determining if there is a significant difference in the mean scores. Assume ? = 0.05.
Version A Version B
Sample size 45 65
Mean score 8.8 8.2
Sample variance 2.6 2.4
What is the test value for this hypothesis test?
Answer=
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