highly significantP = 0.001
The ANOVA of the quadratic regression model (Table 2 ) demonstrated that Eq. ( 1 ) is a highly significant model ( P = 0.001).
The ANOVA of the quadratic regression model (Table 2 ) demonstrated that Eq. ( 1 ) is a highly significant model ( P = 0.001).
Also the values of pH (X 1 ), yeast extract (X 3 ), l -tyrosine (X 7 ), and CuSO 4 (X 8 ) were above the t value limit that implies that these factors are possibly significant.