The college admissions office has determined that the correlation between IQ scores and college grade point average is .50.This means that _____ percent of the variation in college grades is accounted for by knowing IQ scores.
A)10
B)15
C)25
D)50

Question

Quizplus · Accepted Answer

Correlation coefficient squared (R^2) gives the percentage of variance in one variable that can be explained by the other variable. Therefore, R^2 = 0.5^2 = 0.25, which means 25% of the variation in college grades is accounted for by knowing IQ scores. So, the best choice is C.

The College Admissions Office Has Determined That the Correlation Between