18. height. X = length of left leg, and X = length of right leg are measured for a sample of 100 adults The model E(Y) = a + BX + X is fitted to the data. and neither Ho: B =0 nor Ho. 2 =0 is rejected.

a) Does this imply that length of leg is not a good predictor of height? Why?

b) Does this imply that Ho: B = =0 would not have a sunall P-value? Why?

c) Suppose rrx, .901.7rx, .902. and Fx,x = .999. What model would you expect to select, using forward selection and the predictors X, and X2? Why?