Culture Condition Improvement for Phytase Production in Solid State Fermentation by Aspergillus ficuum Using Statistical Method

Table 6

Analysis of variance (ANOVA) for the quadratic model.

Source	Sum of squares	df	F Value	Prob > F
Model	211.1123	10	127.256	<0.0001
𝑋1	64.68167	1	389.8933	<0.0001
𝑋2	0.96	1	5.786764	0.0286
𝑋3	2.041667	1	12.30692	0.0029
𝑋4	0.023048	1	0.138928	0.7142
𝑋1𝑋4	0.5625	1	3.390682	0.0842
𝑋3𝑋4	9.3025	1	56.07434	<0.0001
𝑋^21	73.18313	1	441.139	<0.0001
𝑋^22	1.381663	1	8.328495	0.0108
𝑋^23	9.678248	1	58.33931	<0.0001
𝑋^24	65.78006	1	396.5143	<0.0001
Residual	2.654333	16
Lack of fit	1.906833	13	0.58868	0.7837
Pure error	0.7475	3
Total	213.7667	26

𝑅² = 0.988; Adj 𝑅² = 0.98.