Table 4 Response surface quadratic model variance analysis.
Source | Sum of squares | df | Mean square | F-value | p Value | |
|---|---|---|---|---|---|---|
Model | 48.45 | 13 | 3.73 | 4.12 | 0.0023 | Significant |
A-time | 23.96 | 1 | 23.96 | 26.52 | < 0.0001 | |
B-Temperature | 7.43 | 1 | 7.43 | 8.22 | 0.0095 | |
C-Ratio | 6.45 | 1 | 6.45 | 7.14 | 0.0146 | |
D-Solvent ratio | 1.38 | 1 | 1.38 | 1.53 | 0.2308 | |
AB | 0.0760 | 1 | 0.0760 | 0.0842 | 0.7747 | |
AC | 0.2048 | 1 | 0.2048 | 0.2266 | 0.6392 | |
AD | 1.06 | 1 | 1.06 | 1.17 | 0.2915 | |
BC | 5.12 | 1 | 5.12 | 5.67 | 0.0274 | |
BD | 1.05 | 1 | 1.05 | 1.16 | 0.2937 | |
CD | 0.5112 | 1 | 0.5112 | 0.5658 | 0.4607 | |
A2 | 0.9635 | 1 | 0.9635 | 1.07 | 0.3141 | |
B2 | 0.1610 | 1 | 0.1610 | 0.1781 | 0.6775 | |
C2 | 0.0123 | 1 | 0.0123 | 0.0136 | 0.9082 | |
Residual | 18.07 | 20 | 0.9036 | |||
Lack of fit | 13.17 | 12 | 1.10 | 1.79 | 0.2072 | Not significant |
Pure error | 4.90 | 8 | 0.6124 | |||
Cor total | 66.52 | 33 |
