Predictor Coefficients P-value
Constant 26.11111 0.00242
X1 Variable -30.6667 0.000253
X2 Variable 19.66667 0.000948
X1X2 Variable -15.75 0.003299
X12 Variable 11.33333 0.022047
X22 Variable 14.33333 0.011606
Table 16: Summary of results of regression analysis for response factor y1 (Disintegration time):