Table 6.
Central composite design matrix of coded and actual factor level.
| Run | Temperature (°C), X1 |
Rotational Speed (rpm), X2 |
Mixing Time (min), X3 |
|||
|---|---|---|---|---|---|---|
| Coded | Actual | Coded | Actual | Coded | Actual | |
| 1 | +1 | 190 | +1 | 60 | −1 | 15 |
| 2 | −1 | 150 | 0 | 45 | 0 | 30 |
| 3 | −1 | 150 | +1 | 60 | +1 | 45 |
| 4 | +1 | 190 | −1 | 30 | +1 | 45 |
| 5 | +1 | 190 | −1 | 30 | −1 | 15 |
| 6 | 0 | 170 | 0 | 45 | 0 | 30 |
| 7 | 0 | 170 | 0 | 45 | 0 | 30 |
| 8 | 0 | 170 | 0 | 45 | 0 | 30 |
| 9 | 0 | 170 | 0 | 45 | +1 | 45 |
| 10 | 0 | 170 | −1 | 30 | 0 | 30 |
| 11 | 0 | 170 | 0 | 45 | −1 | 15 |
| 12 | 0 | 170 | 0 | 45 | 0 | 30 |
| 13 | 0 | 170 | 0 | 45 | 0 | 30 |
| 14 | 0 | 170 | 0 | 45 | 0 | 30 |
| 15 | −1 | 150 | +1 | 60 | −1 | 15 |
| 16 | −1 | 150 | −1 | 30 | +1 | 45 |
| 17 | 0 | 170 | +1 | 60 | 0 | 30 |
| 18 | +1 | 190 | +1 | 60 | +1 | 45 |
| 19 | −1 | 150 | −1 | 30 | −1 | 15 |
| 20 | +1 | 190 | 0 | 45 | 0 | 30 |