Run no. X1 X2 X3 Yield
Experimental Predicted
1 0 0 0 95.359 95.359
2 0 0 -1.68 91.819 93.642
3 0 0 0 95.359 95.359
4 0 1.68 0 89.939 89.194
5 1.68 0 0 96.720 97.038
6 1 1 -1 95.226 94.591
7 -1 1 1 87.315 88.478
8 1 -1 1 91.848 92.118
9 0 0 0 95.359 95.359
10 0 0 1.68 91.371 89.548
11 -1 -1 1 87.098 87.733
12 0 0 0 95.359 95.359
13 -1.68 0 0 90.555 90.237
14 1 1 1 90.284 91.278
15 -1 -1 -1 90.289 89.295
16 0 0 0 95.359 95.359
17 0 -1.68 0 87.824 88.569
18 0 0 0 95.359 95.359
19 -1 1 -1 91.150 90.880
20 1 -1 -1 95.754 94.591
Table 3: Experimental and predicted data for the yield of biodiesel obtained from the central composite experimental design.