The Pearson correlation between X1 and Y is r = 0.70. When a second variable, X2, is added to the regression equation, we obtain R2 = 0.64. How much variance for the Y scores is predicted by using only X1 as a predictor variable?
A) ?0.06 or 6%
B) ?0.15 or 15%
C) ?0.49 or 49%
D) ?0.70 or 70%
C
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