Table 5 Design of experiment (DOE), and results of DOE and statistical predictions
From: Pretreatment of rice straw with combined process using dilute sulfuric acid and aqueous ammonia
Run | X1 | X2 | X3 | Observed glucose (%) | Predicted glucose (%) | Residual | 95% confidence limits for mean predicted value | |
|---|---|---|---|---|---|---|---|---|
1 | −1 | −1 | −1 | 48.17 | 43.85 | 4.32 | 35.53 | 52.17 |
2 | +1 | −1 | −1 | 60.55 | 56.41 | 4.14 | 48.09 | 64.73 |
3 | −1 | +1 | −1 | 62.01 | 59.43 | 2.58 | 51.11 | 67.75 |
4 | +1 | +1 | −1 | 78.22 | 76.73 | 1.49 | 68.41 | 85.05 |
5 | −1 | −1 | +1 | 43.32 | 43.23 | 0.09 | 34.91 | 51.55 |
6 | +1 | −1 | +1 | 48.14 | 49.14 | −1.00 | 40.82 | 57.46 |
7 | −1 | +1 | +1 | 78.21 | 80.77 | −2.56 | 72.45 | 89.09 |
8 | +1 | +1 | +1 | 88.68 | 91.42 | −2.74 | 83.10 | 99.74 |
9 | −1.682 | 0 | 0 | 55.32 | 57.18 | −1.86 | 49.26 | 65.11 |
10 | +1.682 | 0 | 0 | 76.35 | 76.70 | −0.35 | 68.78 | 84.63 |
11 | 0 | −1.682 | 0 | 24.46 | 28.18 | −3.72 | 20.25 | 36.10 |
12 | 0 | +1.682 | 0 | 78.35 | 76.84 | 1.51 | 68.92 | 84.77 |
13 | 0 | 0 | −1.682 | 58.47 | 65.15 | −6.68 | 57.22 | 73.7 |
14 | 0 | 0 | +1.682 | 81.45 | 76.98 | 4.47 | 69.06 | 84.91 |
15 | 0 | 0 | 0 | 77.96 | 78.14 | −0.18 | 73.99 | 82.29 |
16 | 0 | 0 | 0 | 79.45 | 78.14 | 1.31 | 73.99 | 82.29 |
17 | 0 | 0 | 0 | 80.98 | 78.14 | 2.84 | 73.99 | 82.29 |
18 | 0 | 0 | 0 | 81.25 | 78.14 | 3.11 | 73.99 | 82.29 |
19 | 0 | 0 | 0 | 78.15 | 78.14 | 0.01 | 73.99 | 82.29 |
20 | 0 | 0 | 0 | 71.45 | 78.14 | −6.69 | 73.99 | 82.29 |