3. For each of the following,

(a) through (d), determine the linear prediction rule for predicting criterion variable Y from predictor variable X. Then

(e) make a single graph (with values from 0 to 10 on both axes) showing all the regression lines, labeling each by its letter. (Be sure to make your graph large enough so that the lines are clearly separate.)

Regression Constant a Regression Coefficient b

(a) 1.5 .8

(b) 10.0 -.4

(c) 2.0 .2

(d) 9.5 -.8