Table 3.

Analysis of variance for quadratic model of exopolysaccharides production

Source	Sum of Squares	df	Mean square	F-value	p-value
Model	2027.53	9	225.28	11.25	0.0004*
X2: Manganese sulfate	248.04	1	248.04	12.39	0.0055*
X6: Yeast extract	929.62	1	929.62	46.42	< 0.0001*
X10: Time	141.51	1	141.51	7.07	0.0240*
X2 × 6	114.31	1	114.31	5.71	0.0380*
X2 × 10	96.84	1	96.84	4.84	0.0525
X6 × 10	14.08	1	14.08	0.70	0.4214
X2²	236.77	1	236.77	11.82	0.0063*
X6²	41.28	1	41.28	2.06	0.1816
X10²	7.10	1	7.10	0.36	0.5648
R2	0.910
R²adjusted	0.829
RMSE	0.40
SEP %	13.09

^{*Significant model terms}