Table 4.

Result of regression analysis for response surface quadratic model

Source	F-value	p value (Prob > F)
Model	117.58	<0.0001	Significant
A: Peptone	9.89	0.0067
B: Yeast extract	147.74	<0.0001
C: KNO3	0.44	0.5186
D: Wheat bran	311.83	<0.0001
AB	42.53	<0.0001
AC	53.38	<0.0001
AD	27.76	<0.0001
BC	8.30	0.0114
BD	68.82	<0.0001
CD	37.85	<0.0001
A 2	184.27	<0.0001
B 2	139.40	<0.0001
C 2	484.74	<0.0001
D 2	474.36	<0.0001