X1 X2 X1 X2 X12 X22 Y2
-1 1 -1 1 1 1.71
0 1 0 0 1 1.45
1 1 1 1 1 0.98
-1 0 0 1 0 0.45
0 0 0 0 0 0.28
1 0 0 1 0 0.16
-1 -1 1 1 1 0.53
0 -1 0 0 1 0.49
1 -1 -1 1 1 0.39
Table 18: Multiple Regression Analysis for Response Factor Y2 (% Friability):