Nanosized Spinel Ferrites Synthesized by Sol-Gel Autocombustion for Optimized Removal of Azo Dye from Aqueous Solution

Table 7

Analysis of variance (ANOVA) for the significance of the multiple regression models.

Source	DF^a	SS^b	MS^c	-value	value
-response (color removal efficiency)
Model	6	1.037 × 10^4	1.728 × 10^3	105.139	< 0.0001	0.986	0.977
Residual	9	147.912	16.435
Total	15	1.052 × 10^4
-response (adsorption capacity)
Model	8	199.745	24.968	31.700	< 0.0001	0.973	0.942
Residual	7	5.513	0.788
Total	15	205.259

^aDegree of freedom; ^bsum of squares; ^cmean square.