How much of the variance in final exam scores is accounted for by the variance in Exam 1's scores, if the coefficient between the two exams is .45?
A) .20
B) .45
C) .67
D) Depends on sample size

Question

Quizplus · Accepted Answer

To find how much of the variance in final exam scores is accounted for by the variance in Exam 1's scores, you square the correlation coefficient (.45^2), which equals .2025, or approximately .20 when rounded. This is because the square of the correlation coefficient (r^2) represents the proportion of variance in one variable that is predictable from the other variable.

How Much of the Variance in Final Exam Scores Is