The college admissions office has determined that the correlation between IQ scores and college grade point average is .50.What 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

The coefficient of determination (r^2) provides the proportion of variance in one variable (college grade point average) that can be explained by another variable (IQ score). Therefore, r^2 = .50^2 = .25, which means that knowing IQ scores accounts for 25% of the variation in college grades. Therefore, the best choice is C.

The College Admissions Office Has Determined That the Correlation Between