|
| Variable (coded) | % Removal of fluoride | |||
| Run | X1 | X2 | X3 | Experimental | Predicted |
| 1 | −1 | −1 | 0 | 45.5 | 46.487 |
| 2 | 1 | −1 | 0 | 35.5 | 38.262 |
| 3 | −1 | 1 | 0 | 23.8 | 20.037 |
| 4 | 1 | 1 | 0 | 37.4 | 35.412 |
| 5 | −1 | 0 | −1 | 10.5 | 10.750 |
| 6 | 1 | 0 | −1 | 14.9 | 13.375 |
| 7 | −1 | 0 | 1 | 17.5 | 19.025 |
| 8 | 1 | 0 | 1 | 23.8 | 23.550 |
| 9 | 0 | −1 | −1 | 80.5 | 78.2625 |
| 10 | 0 | 1 | −1 | 58.8 | 63.312 |
| 11 | 0 | −1 | 1 | 86.7 | 87.187 |
| 12 | 0 | 1 | 1 | 70.6 | 72.837 |
| 13 | 0 | 0 | 0 | 77.5 | 78.166 |
| 14 | 0 | 0 | 0 | 78.0 | 78.166 |
| 15 | 0 | 0 | 0 | 79.0 | 78.166 |