Table 7 Test results from comparison of the third-order polynomial effects of the factors
| Result from testing Ho: β1=β11=β111=0 (Factor: Peptone) |
| Source | Degrees of freedom | Mean square | F-value | p-value |
| Numerator | 3 | 0.03155 | 5.29 | 0.0086 |
| Denominator | 18 | 0.00596 | | |
| Result from testing Ho: β2=β22=β222=0 (Factor: Glucose) |
| Source | Degrees of freedom | Mean square | F-value | p-value |
| Numerator | 3 | 0.04572 | 7.67 | 0.0017 |
| Denominator | 18 | 0.00596 | | |
| Result from testing Ho: β3=β33=β333=0 (Factor: Yeast extract) |
| Source | Degrees of freedom | Mean square | F-value | p-value |
| Numerator | 3 | 0.18887 | 31.67 | <0.0001 |
| Denominator | 18 | 0.00596 | | |
| Result from testing Ho: β4=β44=β444=0 (Factor: Magnesium sulfate) |
| Source | Degrees of freedom | Mean square | F-value | p-value |
| Numerator | 3 | 0.01779 | 2.98 | 0.0587 |
| Denominator | 18 | 0.00596 | | |
yeast extract>glucose≅peptone>magnesium sulfate.