In a study of the relation between hours watching TV per day (X) and scores on the final exam (Y), the equation of regression line is found to be Y' = -7X + 100. Suppose Jamie watches TV two hours per day, and he scored a 91 on the exam. What is the residual score for Jamie?
A) -7
B) -5
C) 0
D) 5
E) 100

Question

Quizplus · Accepted Answer

The residual score is the difference between the actual score and the predicted score. The predicted score for Jamie, who watches TV two hours per day, is Y' = -7(2) + 100 = -14 + 100 = 86. Jamie's actual score is 91. Therefore, the residual score is 91 - 86 = 5.

In a Study of the Relation Between Hours Watching TV