The SAS System 1 21:07 Wednesday, November 12, 2003 Model: MODEL1 Dependent Variable: Y Analysis of Variance Sum of Mean Source DF Squares Square F Value Prob>F Model 2 1504.41333 752.20667 72.497 0.0001 Error 17 176.38667 10.37569 C Total 19 1680.80000 Root MSE 3.22113 R-square 0.8951 Dep Mean 19.40000 Adj R-sq 0.8827 C.V. 16.60377 Parameter Estimates Parameter Standard T for H0: Variable DF Estimate Error Parameter=0 Prob > |T| INTERCEP 1 33.874069 1.81385830 18.675 0.0001 X 1 -0.101742 0.00889122 -11.443 0.0001 Z 1 8.055469 1.45910570 5.521 0.0001 The SAS System 2 21:07 Wednesday, November 12, 2003 Model: MODEL2 Dependent Variable: Y Analysis of Variance Sum of Mean Source DF Squares Square F Value Prob>F Model 3 1504.41904 501.47301 45.490 0.0001 Error 16 176.38096 11.02381 C Total 19 1680.80000 Root MSE 3.32021 R-square 0.8951 Dep Mean 19.40000 Adj R-sq 0.8754 C.V. 17.11450 Parameter Estimates Parameter Standard T for H0: Variable DF Estimate Error Parameter=0 Prob > |T| INTERCEP 1 33.838369 2.44064985 13.864 0.0001 X 1 -0.101531 0.01305254 -7.779 0.0001 Z 1 8.131250 3.65405169 2.225 0.0408 XZ 1 -0.000417 0.01833121 -0.023 0.9821