Chapter 3, Section 3.3, GO Tutorial Problem 1 After teaching the same history co

Question

Chapter 3, Section 3.3, GO Tutorial Problem 1 After teaching the same history course for 100 times, an instructor found that the correlation, r, between the students' total number of points before the final examination and the number of points scored on their final examination is 0.8. The pre-final exam point totals for all students in the current course have mean 280 and SD 31. The points on the final exam have mean 76 and SD 7. The instructor's dog ate Julie's final exam, but the instructor knows that her total number of points before the exam was 00. He decides to predict her final exam score from her pre-final-exam total. What value will he get? Round your answer to a whole percentage ulie's final exam score is tolerance is +/-296 the tolerance is +/-2% the

Explanation / Answer

Slope = (0.8*7/31) = 0.1806

Intercept = 76-0.1806*280 = 25.4194

Predicted Score = 0.1806*300+25.4194 = 80%

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