Table 3.
Analysis of variance (ANOVA) of the modelled responses.
| Source | Sum of Squares | Degree of Freedom | Mean Square | F-Value | p-Value |
|---|---|---|---|---|---|
| Theobromine | |||||
| The recovery | |||||
| Model | 13.06 | 9 | 1.45 | 6.14 | 0.0129 |
| Residual | 1.65 | 7 | 0.24 | ||
| Lack of fit | 0.92 | 3 | 0.31 | 1.66 | 0.3117 |
| Pure error | 0.74 | 4 | 0.18 | ||
| Total | 14.72 | 16 | |||
| R2 = 0.887 | |||||
| Caffeine | |||||
| The recovery | |||||
| Model | 0.064 | 9 | 0.007 | 7.75 | 0.0066 |
| Residual | 0.006 | 7 | 0.0009 | ||
| Lack of fit | 0.005 | 3 | 0.002 | 9.24 | 0.0585 |
| Pure error | 0.0008 | 4 | 0.0002 | ||
| Total | 0.071 | 16 | |||
| R2 = 0.909 | |||||
| Total phenols | |||||
| The recovery | |||||
| Model | 13,944.84 | 9 | 1549.43 | 10.81 | 0.0024 |
| Residual | 1003.19 | 7 | 143.31 | ||
| Lack of fit | 584.97 | 3 | 194.99 | 1.86 | 0.2763 |
| Pure error | 418.22 | 4 | 104.55 | ||
| Total | 14,948.03 | 16 | |||
| R2 = 0.933 | |||||
| DPPH | |||||
| The recovery | |||||
| Model | 6643.02 | 9 | 738.11 | 6.02 | 0.0137 |
| Residual | 858.97 | 7 | 122.71 | ||
| Lack of fit | 364.94 | 3 | 121.65 | 0.98 | 0.4842 |
| Pure error | 494.03 | 4 | 123.51 | ||
| Total | 7502.00 | 16 | |||
| R2 = 0.886 | |||||