Table 3.

Estimated regression coefficients and ANOVA for optimization of decolorization efficiency (D.E. (%)).

Term	Coefficient	SE Coefficient	T-value	P-value
Constant	91.374	5.156	17.722	0.000
A	11.215	5.069	2.212	0.063
B	17.214	5.069	3.396	0.012
A2	–12.117	7.472	–1.622	0.149
B2	–6.863	7.472	–0.918	0.389
AB	–20.055	6.209	–3.230	0.014

SE Coefficient = standard error of the coefficient.