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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
  1. X1: Temperature.
  2. X2: Concentration of aqueous ammonia.
  3. X3: Reaction time.