Table 3.

The least-square fit and parameters (significant of regression coefficient) of culture medium component.

Model	Unstandardized Coefficients		Standardized Coefficients	t	Sig	95.0 % Confidence Interval for B
	B	Std. Error	Beta			Lower Bound	Upper Bound
Constant	35.274	1.012		34.858	<0.001	33.104	37.444
X1 (Crude glycerol)	9.318	0.653	0.663	14.266	<0.001	7.917	10.719
X2 ((NH4)2SO4)	0.818	0.653	0.058	1.253	0.231	−0.583	2.219
X3 (MgSO4)	1.939	0.653	0.138	2.969	0.010	0.538	3.340
X4 (CaCl2)	1.912	0.653	0.136	2.928	0.011	0.512	3.313
X12	−12.260	0.888	−0.667	−13.799	<0.001	−14.165	−10.354
X22	−5.740	0.888	−0.312	−6.460	<0.001	−7.645	−3.834
X32	−3.826	0.888	−0.208	−4.306	0.001	−5.731	−1.920
X42	−0.803	0.888	−0.044	−0.904	0.381	−2.709	1.102
X1X2	0.542	1.131	0.022	0.480	0.639	−1.884	2.969
X1X3	1.715	1.131	0.070	1.516	0.152	−0.712	4.142
X1X4	1.313	1.131	0.054	1.160	0.265	−1.114	3.739
X2X3	−3.310	1.131	−0.136	−2.926	0.011	−5.737	−0.883
X2X4	−0.848	1.131	−0.035	−0.749	0.466	−3.274	1.579
X3X4	0.802	1.131	0.033	0.709	0.490	−1.624	3.229

Dependent Variables: 1,3-PDO.