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The variance of pre-exam grades was 9 and the variance of

A research study found that in one physics class, the correlation between pre-exam and post-exam grades was 0.90. The variance of pre-exam grades was 9 and the variance of post-exam grades was 16. Thus, the variance of the difference between pre-exam and post-exam grades is: (show work)

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Basic Statistics: The variance of pre-exam grades was 9 and the variance of

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