Table 2 Range and level of variables in the full factorial CCD matrix and response
S. no. | Glucose (g/L) | Ammonium sulfate (g/L) | pH | Temperature (°C) | Response (dye degradation, %) | |
|---|---|---|---|---|---|---|
X 1 | X 2 | X 3 | X 4 | Observed (Y j) | Predicted (Ŷ j) | |
1 | −1 | −1 | −1 | −1 | 64 | 65 |
2 | +1 | −1 | −1 | −1 | 77 | 79 |
3 | −1 | +1 | −1 | −1 | 67 | 65 |
4 | +1 | +1 | −1 | −1 | 70 | 72 |
5 | −1 | −1 | +1 | −1 | 54 | 56 |
6 | +1 | −1 | +1 | −1 | 73 | 74 |
7 | −1 | +1 | +1 | −1 | 54 | 52 |
8 | +1 | +1 | +1 | −1 | 65 | 65 |
9 | −1 | −1 | −1 | +1 | 67 | 69 |
10 | +1 | −1 | −1 | +1 | 77 | 77 |
11 | −1 | +1 | −1 | +1 | 72 | 75 |
12 | +1 | +1 | −1 | +1 | 78 | 79 |
13 | −1 | −1 | +1 | +1 | 61 | 60 |
14 | +1 | −1 | +1 | +1 | 78 | 79 |
15 | −1 | +1 | +1 | +1 | 64 | 63 |
16 | +1 | +1 | +1 | +1 | 73 | 75 |
17 | −2 | 0 | 0 | 0 | 41 | 39 |
18 | +2 | 0 | 0 | 0 | 66 | 62 |
19 | 0 | −2 | 0 | 0 | 76 | 78 |
20 | 0 | +2 | 0 | 0 | 73 | 69 |
21 | 0 | 0 | −2 | 0 | 80 | 80 |
22 | 0 | 0 | +2 | 0 | 73 | 69 |
23 | 0 | 0 | 0 | −2 | 70 | 71 |
24 | 0 | 0 | 0 | +2 | 77 | 75 |
25 | 0 | 0 | 0 | 0 | 79 | 80 |
26 | 0 | 0 | 0 | 0 | 78 | 80 |
27 | 0 | 0 | 0 | 0 | 79 | 80 |
28 | 0 | 0 | 0 | 0 | 80 | 80 |
29 | 0 | 0 | 0 | 0 | 81 | 80 |
30 | 0 | 0 | 0 | 0 | 80 | 80 |