Table 2.

ANOVA analysis for the fractional factorial design carried out to determine the factors that have significant effect on the decolorization efficiency (D.E. (%)).

Term	Coefficient	SE Coefficient	T-value	P-value
Constant	71.78	0.9575	74.97	0.000
A	18.90	0.9575	19.74	0.000
B	21.53	0.9575	22.48	0.000
C	–1.08	0.9575	–1.13	0.341
AB	–20.93	0.9575	–21.86	0.000
BC	0.07	0.9575	0.08	0.943
AC	0.24	0.9575	0.25	0.817
ABC	0.99	0.9575	1.03	0.378

SE Coefficient = standard error of the coefficient.