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Table 2 Two-level factorial design of variables (in coded levels) with actual values and predicted response

From: Statistical optimization of xylanase production, using different agricultural wastes by Aspergillus oryzae MN894021, as a biological control of faba bean root diseases

Run A B C D E Xylanase activity (U/ml)
Substrate concentration (%) Yeast extract (g/l) (NH4)2SO4 (g/l) KH2PO4 (g/l) MgSO4.7H2O (g/l) Actual response Predicted response
1 2.5 9 6 2.5 2 0.8900 0.8688
2 2.5 9 2 1.5 3 0.6000 0.6350
3 1.5 9 2 2.5 2 0.6300 0.6025
4 1.5 9 2 1.5 3 0.6000 0.5950
5 1.5 9 6 1.5 2 0.7500 0.7725
6 2.5 7 6 1.5 2 0.7200 0.7388
7 2.5 9 2 2.5 3 0.6000 0.6438
8 1.5 7 6 2.5 3 0.5000 0.5063
9 2.5 9 2 2.5 2 0.7300 0.7275
10 1.5 9 6 2.5 3 0.7900 0.8225
11 1.5 9 6 2.5 2 0.7200 0.7113
12 2.5 7 6 1.5 3 0.7700 0.7775
13 2.5 7 6 2.5 2 0.7000 0.7025
14 2.5 9 6 1.5 2 0.9000 0.8550
15 2.5 7 2 2.5 2 0.7000 0.6813
16 1.5 7 6 1.5 2 0.5500 0.5863
17 1.5 7 2 1.5 3 0.4000 0.4388
18 1.5 7 2 2.5 3 0.4300 0.4125
19 2.5 7 2 2.5 3 0.6000 0.5625
20 1.5 7 6 2.5 2 0.6600 0.6150
21 1.5 9 6 1.5 3 0.7600 0.7563
22 2.5 9 6 1.5 3 0.8900 0.9238
23 2.5 7 6 2.5 3 0.7400 0.6788
24 1.5 9 2 1.5 2 0.5800 0.5313
25 2.5 7 2 1.5 2 0.4000 0.4250
26 2.5 9 6 2.5 3 0.8900 0.9050
27 2.5 7 2 1.5 3 0.4300 0.4338
28 1.5 7 6 1.5 3 0.6900 0.7000
29 1.5 7 2 1.5 2 0.3800 0.4100
30 2.5 9 2 1.5 2 0.7500 0.7513
31 1.5 7 2 2.5 2 0.3500 0.3513
32 1.5 9 2 2.5 3 0.5600 0.5388