Find the rms error for the regression prediction of a student's Exam 2 score given their Exam 1 score.

Average Exam 1:79.86%Exam 1 SD:18.78%

Average Exam 2:44%Exam 2 SD:24.55%

r = 0.68

r.m.s. error =Square root of (1-r^2) (SDy)

18.00

13.89

29.69

13.77

Find the regression equation for predicting a student's score on Exam 2 from the student's score on Exam 1.

m=(SDy/SDx) *(r)

b=Avey-m(Avex)

y = 0.89x + 115.08

y = 0.52x + 43.54

y = 0.52x - 2.47

y = 0.89x - 27.08

Using the regression equation from question #21. Predict a student's Exam 2 score from an Exam 1 score of 92%.

115.08%

54.80%

45.37%

91.38%