Table 2: RSM Box Behnken Design matrix and results in Experimental value, and predicted values from RSM and ANN.

Sample No. pH The concentration of the Binary Inhibitor (mg /L) Time (Days) Experimental Corrosion Rate (mm /yr) Predicted Values Residual Values
RSM ANN RSM ANN
1 8 23 13 0.32 0.33 0.33 -0.01 0.01
2 5 23 3 0.13 0.33 0.12 -0.20 0.01
3 5 15 13 0.58 0.81 0.58 -0.23 0.00
4 6 19 17 0.85 0.74 0.85 0.11 0.00
5 5 23 21 0.98 0.78 0.99 0.20 0.01
6 6 26 17 0.09 0.33 0.08 -0.24 0.01
7 6 26 8 0.05 0.07 0.07 -0.02 0.02
8 4 26 17 0.08 0.33 0.09 -0.25 0.01
9 4 19 8 0.69 0.49 0.70 0.20 0.01
10 7 23 13 0.24 0.33 0.23 -0.09 0.01
11 4 26 8 0.29 0.07 0.28 0.22 0.01
12 6 19 8 0.58 0.49 0.58 0.09 0.00
13 4 19 17 0.81 0.74 0.81 0.07 0.00
14 3 23 13 0.37 0.33 0.36 0.04 0.01
15 5 30 13 0.04 -0.09 0.04 0.13 0.00