Table 4 Experimental design and results of central composition experiment
Run | Coded variable level | 2,3-BD (g/L) | |||
|---|---|---|---|---|---|
X 1 | X 2 | X 3 | Observed | Predicted | |
1 | −1 | −1 | −1 | 32.2 | 32.2 |
2 | 1 | −1 | −1 | 35.0 | 35.0 |
3 | −1 | 1 | −1 | 34.0 | 34.9 |
4 | 1 | 1 | −1 | 33.6 | 32.6 |
5 | −1 | −1 | 1 | 35.7 | 35.8 |
6 | 1 | −1 | 1 | 41.0 | 39.2 |
7 | −1 | 1 | 1 | 37.9 | 36.9 |
8 | 1 | 1 | 1 | 36.1 | 35.3 |
9 | −1.682 | 0 | 0 | 36.2 | 35.8 |
10 | 1.682 | 0 | 0 | 35.2 | 36.8 |
11 | 0 | −1.682 | 0 | 33.8 | 34.4 |
12 | 0 | 1.682 | 0 | 32.7 | 33.3 |
13 | 0 | 0 | −1.682 | 34.5 | 34.1 |
14 | 0 | 0 | 1.682 | 37.7 | 39.3 |
15 | 0 | 0 | 0 | 41.3 | 41.8 |
16 | 0 | 0 | 0 | 43.0 | 41.8 |
17 | 0 | 0 | 0 | 40.7 | 41.8 |
18 | 0 | 0 | 0 | 42.7 | 41.8 |
19 | 0 | 0 | 0 | 41.6 | 41.8 |
20 | 0 | 0 | 0 | 41.8 | 41.8 |