Table 5. Variance analysis of response surface quadratic model for EPS production and broth viscosity of strain SM-A87.

Source	df	EPS productiona				Broth viscosityb
		Sum of Squares	Mean Square	F Value	p-value Prob > F	Sum of Squares	Mean Square	F Value	p-value Prob > F
Model	9	11.00	1.22	44.78	<0.0001c	2.438E+007	2.708E+006	32.96	<0.0001c
X 1	1	0.38	0.38	13.86	0.0040c	1.388E+006	1.388E+006	16.90	0.0021c
X 2	1	0.013	0.013	0.47	0.5096	37419.36	37419.36	0.46	0.5151
X 3	1	0,017	0.017	0.63	0.4459	11306.90	11306.90	0.14	0.7184
X 1 X 2	1	0.55	0.55	20.17	0.0012c	4.267E+005	4.267E+005	5.19	0.0459c
X 1 X 3	1	0.24	0.24	8.93	0.0136c	31815.03	31815.03	0.39	0.5477
X 2 X 3	1	0.97	0.97	35.37	0.0001c	1.988E+006	1.988E+006	24.19	0.0006c
X 1 2	1	0.63	0.63	22.96	0.0007c	1.623E+006	1.623E+006	19.75	0.0012c
X 2 2	1	3.83	3.83	140.47	<0.0001c	8.492E+006	8.492E+006	103.35	<0.0001c
X 3 2	1	5.68	5.68	207.98	<0.0001c	1.346E+007	1.346E+007	163.77	<0.0001c
Residual	10	0.27	0.027			8.217E+005	82170.07
Lack of Fit	5	0.21	0.041	3.09	0.1207	6.196E+005	1.239E+005	3.07	0.1221
Pure Error	5	0.067	0.013			2.021E+005	40413.87
Cor Total	19	11.27				2.520E+007

^a R ² = 0.9758; Adj R ² = 0.9540; CV = 2.17%.

^b R ² = 0.9674; Adj R ² = 0.9380; CV = 5.59%.

^cModel terms are significant.