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Analysis of variance for the response of xylanase production
| Source | df | ∑x2 (×106) | F-value | P>F |
| Linear product | 3 | 5.47 | 7.18 | 0.007 |
| Quadratic product | 3 | 20.43 | 26.78 | 0.000 |
| Cross product | 3 | 4.35 | 5.70 | 0.015 |
| Total model | 9 | 30.26 | 13.22 | 0.000 |
| Total error | 10 | 2.54 |
