Table 3.

Identification of significant variables for EPS production of strain (9I) using PB design.

EPS production
Variables		Coefficients	Standard error	t Stat	p-Value
Intercept		4.69	0.12	39.01	3.71
X1	Yeast extract	1.28	0.14	9.13	0.002
X2	Sugarcane molasses	1.57	0.57	2.75	0.070
X3	MgSO4	−1.18	0.48	−2.42	0.093
X4	K2HPO4	0.58	0.14	4.12	0.025
X5	KH2PO4	−0.49	0.14	−3.47	0.04
X6	Peptone	0.65	0.14	4.61	0.01
X7	Incubation time	−0.13	0.14	−0.95	0.41
X8	Inoculum size	−0.47	0.14	−3.34	0.044
X9	Temperature	1.01	0.14	7.19	0.005
X10	pH	−0.32	0.14	−2.30	0.10
X11	Shaking	0.037	0.14	0.26	0.80
Regression statistics
Multiple R		0.995	Adjusted R square	0.954
R square		0.990	Standard error	0.360