highly significantp < 0.0001
Multiple regression analysis of the experimental data correlated the response and test variables according to a second-order polynomial equation: (8) EE = + 85.41 + 1.34 X 1 + 4.86 X 2 + 2.59 X 3 + 1.87 X 1 X 2 − 0.65 X 1 X 3 + 1.07 X 2 X 3 − 1.47 X 1 2 − 9.52 X 2 2 − 2.10 X 3 2 Table 1 shows that this model had highly significant fitness because its F-test had a high F-value (116.14) and a low p -value ( p < 0.0001).