Optimization, Characterization, and Antibacterial Activity of Copper Nanoparticles Synthesized Using Senna didymobotrya Root Extract

Table 3

Calculated values of the coefficients of the model.

Term	Effect	Coeff	SE coeff	T-value	value	VIF
Constant		53.580	1.020	52.65	0.001
Temp	−8.635	−4.317	0.623	−6.93	0.001	1.00
Conc	−6.855	−3.427	0.623	−5.50	0.003	1.00
pH	39.950	19.975	0.623	32.05	0.001	1.00
Temp ∗ Temp	−21.528	−10.764	0.917	−11.73	0.001	1.01
Conc ∗ Conc	−4.088	−2.044	0.917	−2.23	0.076	1.01
pH ∗ pH	23.008	−11.504	0.917	−12.54	0.001	1.01
Temp ∗ Conc	6.305	3.153	0.881	3.58	0.016	1.00
Temp ∗ pH	3.895	1.948	0.881	2.21	0.078	1.00
Conc ∗ pH	−3.035	−1.518	0.881	−1.72	0.146	1.00

Conc = concentration and Temp = temperature.