Table 2 Analysis of variance (ANOVA) of the second-order model for the experimental data from the CCD design
Source of variation | Sum of squares | Degrees of freedom | Mean square | F-calc | F-tab | p-value |
|---|---|---|---|---|---|---|
Regression | 27,195.818 | 20 | 1359.79092 | 4.93 | 2.01 | 0.000127** |
Residual | 6899.4605 | 25 | 275.978418 | |||
Lack of fit | 6701.99 | 22 | 304.635714 | 4.63 | 8.66 | 0.11582 |
Pure terror | 197.47 | 3 | 65.8249178 | |||
Total | 34,095.28 | 45 |