Table 2. Analyses of the variance (ANOVA) of the response surface quadratic model for inactivating E. coli and S. aureus in greywater using bimetallic (Cu/Zn) NPs.

Source	Sum of squares		DF	Mean squares		F value		P value
	y1a	y2b		y1	y2	y1	y2	y1	y2
Model	30.71	31.26	9	3.41	4.37	25.16	7.68	< 0.0001	0.0019
Residual	1.36	4.52	10	0.14	0.45
Lack-of-fit	0.85	3.74	5	0.17	0.75	1.68	4.77	0.2924	0.0558
Pure error	0.51	0.78	5	0.10	0.16
Total	32.07	35.78	19

y₁ (E. coli); y₂ (S.aureus); a) R² = 0.9577; Adj R² = 0.9196; b) R² = 0.8737; Adj R² = 0.7600