A regression equation is given below.

Y=45+8X

a. What is the change in Y when X changes by +6?

b. What is the change in Y when X changes by 2?

c. What is the predicted value of Y when X=11?

d. What is the predicted value of Y when X=20?

e. Does this equation prove that a change in X causes a change in Y?

e. Does this equation prove that a change in X causes a change in Y?

Yes, because b1 is positive, increases in X cause Y to increase.

No, because regression results cannot prove causation.