Optimization of Fermentation Medium for the Production of Atrazine Degrading Strain Acinetobacter sp. DNS32 by Statistical Analysis System

Table 6

Effect estimates for the second-order polynomial model.

Model term	Degree of freedom	Estimate	Standard error	𝑡-value	𝑃>|𝑡|
Intercept	1	8.846	0.0115	766.830	<0.0001^a
𝑋1	1	−0.0140	0.00765	−1.831	0.0970
𝑋2	1	0.0202	0.00765	2.640	0.0247^a
𝑋3	1	0.0131	0.00765	1.714	0.1172
𝑋12	1	−0.0870	0.00745	−11.679	<0.0001^a
𝑋22	1	−0.0706	0.00745	−9.470	<0.0001^a
𝑋32	1	−0.0250	0.00745	−3.357	0.0073^a
𝑋1 𝑋2	1	−0.0107	0.0100	−1.066	0.3115
𝑋1 𝑋3	1	0.0262	0.0100	2.624	0.0254^a
𝑋2 𝑋3	1	0.00893	0.0100	0.893	0.3929

^aSignificant at 5% level (𝑃<0.05).