The correct answer for this question is this one: "B. 90.7%" The percent of variation in the reading level can be explained by changes in the grade level is 90.7%
You have to compute the coefficient of correlation and then use a formula to get the explained variation.
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These are the following choices:
A. 74.7%
B. 90.7%
C. 82.4%
D. 86.6%
