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Test design and results of response surface of second group.
| No. | X1 | X2 | X3 | Y1 (%) |
|---|---|---|---|---|
| 1 | − 1 | − 1 | − 1 | 12.52 |
| 2 | 0 | − 1 | − 1 | 10.87 |
| 3 | 1 | − 1 | − 1 | 9.92 |
| 4 | − 1 | − 1 | 1 | 9.28 |
| 5 | 0 | − 1 | 1 | 8.06 |
| 6 | 1 | − 1 | 1 | 8.17 |
| 7 | 0 | − 1 | 0 | 8.94 |
| 8 | 1 | − 1 | 0 | 8.47 |
| 9 | − 1 | 0 | − 1 | 10.51 |
| 10 | 0 | 0 | − 1 | 9.41 |
| 11 | 1 | 0 | − 1 | 7.96 |
| 12 | − 1 | 0 | 1 | 8.22 |
| 13 | 0 | 0 | 1 | 6.67 |
| 14 | 1 | 0 | 1 | 7.45 |
| 15 | − 1 | 0 | 0 | 9.68 |
| 16 | 0 | 0 | 0 | 9.27 |
| 17 | − 1 | 1 | − 1 | 12.61 |
