Table 2.
Design matrix for the three coded factors with the experimental and predicted responses.
| Runs | Factors | Responses | |||||
|---|---|---|---|---|---|---|---|
| X 1 | X 2 | X 3 | E (kPa) | ESR (%) | |||
| Experimental | Predicted | Experimental | Predicted | ||||
| F1 | −1 | −1 | 0 | 82.45 ± 5.19 | 82.31 | 3341.77 ± 32.62 | 3322.74 |
| F2 | +1 | 0 | +1 | 88.76 ± 1.14 | 88.12 | 2482.10 ± 55.04 | 2478.13 |
| F3 | −1 | 0 | −1 | 65.76 ± 5.36 | 66.40 | 3202.14 ± 15.68 | 3206.11 |
| F4 | 0 | 0 | 0 | 72.85 ± 2.14 | 71.25 | 2908.54 ± 68.62 | 2881.79 |
| F5 | +1 | −1 | 0 | 93.52 ± 4.97 | 94.23 | 2582.54 ± 27.65 | 2572.46 |
| F6 | 0 | +1 | +1 | 70.30 ± 1.35 | 70.80 | 2699.23 ± 10.70 | 2684.18 |
| F7 | +1 | 0 | −1 | 79.62 ± 3.02 | 79.40 | 2578.34 ± 49.14 | 2573.37 |
| F8 | 0 | 0 | 0 | 70.26 ± 4.61 | 71.25 | 2894.69 ± 13.46 | 2881.79 |
| F9 | 0 | 0 | 0 | 71.53 ± 3.19 | 71.25 | 2835.63 ± 100.92 | 2881.79 |
| F10 | 0 | +1 | −1 | 54.73 ± 1.77 | 54.80 | 2739.41 ± 62.41 | 2725.35 |
| F11 | 0 | 0 | 0 | 70.36 ± 3.71 | 71.25 | 2888.30 ± 37.31 | 2881.79 |
| F12 | −1 | +1 | 0 | 66.23 ± 5.16 | 65.51 | 3026.64 ± 78.90 | 3036.72 |
| F13 | −1 | 0 | +1 | 88.38 ± 1.48 | 88.60 | 3159.75 ± 66.13 | 3164.72 |
| F14 | +1 | +1 | 0 | 65.96 ± 4.98 | 66.10 | 2448.64 ± 22.52 | 2467.67 |
| F15 | 0 | −1 | −1 | 78.30 ± 4.61 | 77.80 | 2932.85 ± 44.76 | 2947.90 |
| F16 | 0 | −1 | +1 | 92.80 ± 6.80 | 92.72 | 2838.37 ± 12.95 | 2852.43 |
X1, X2, and X3 represent the concentration of PL, BGP, and GE, respectively. Experimental data are reported as mean ± SD (n = 3).