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).