| Source | DF | Adj SS | Adj MS | F-value | P-value |
| Regression | 14 | 4027.31 | 287.66 | 6.07 | 0.000 |
| Linear | 4 | 1807.12 | 451.78 | 9.53 | 0.000 |
| Square | 4 | 807.49 | 201.87 | 4.26 | 0.016 |
| Interaction | 6 | 1412.70 | 235.45 | 4.97 | 0.005 |
| Error | 16 | 758.46 | 47.40 |
|
|
| Lack of fit | 10 | 570.21 | 57.02 | 1.82 | 0.240 |
| Pure error | 6 | 188.25 | 31.38 |
|
|
| Total | 30 | 4785.77 |
|
|
|