Predictor Coefficients P-value
  FM RM FM RM
Constant 0.321111 0.296667 0.007005 0.001157
X1 Variable -0.19333 -0.19333 0.005345 0.001578
X2 Variable 0.455 0.455 0.000433 5.63E-05
X1X2 Variable -0.1475 -0.1475 0.02005 0.008917
X12 Variable -0.03667 - 0.483493 -
X22 Variable 0.628333 0.296667 0.000848 0.001157
Table 19: Summary of results of regression analysis for response factor Y2 (% Friability).