A fitted regression for an exam in Prof. Hardtack's class showed Score = 20 + 7 Study, where Score is the student's exam score and Study is the student's study hours. The regression yielded R² = 0.50 and SE = 8. Bob studied 9 hours. The quick 95 percent prediction interval for Bob's grade is approximately: A)69 to 97. B)75 to 91. C)67 to 99. D)76 to 90.

Question

Quizplus · Accepted Answer

The predicted score for Bob is 20 + 7(9) = 83. The prediction interval is calculated as the predicted score ± 2*SE, which is 83 ± 16, resulting in an interval of 67 to 99.

A Fitted Regression for an Exam in Prof