A professor measures the time X that students take to complete an examination, and the score Y that the students receive. The following measurements are obtained: X: time, Average time (X) = 30 SDx = 10 Y: scores, Average score (Y) = 70 SDy = 20 r = .5
a. About what percentage of students who scored over 92 in the exam?
b. Find the regression equation
c. Evaluate the r.m.s. error for the regression equation.