Table 4.
ANOVA for the quadratic experimental models for caffeine, trigonelline, and nicotinic acid, along with the significant values, where the symbol * stands for a p-value (p) ≤ 0.05, ** for p ≤ 0.01, and *** for p ≤ 0.001.
| Caffeine | Trigonelline | Nicotinic Acid | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Source | d.f. | Sum of Squares | Mean Square | F-ratio | Sig. | Sum of Squares | Mean Square | F-ratio | Sig. | Sum of Squares | Mean Square | F-ratio | Sig. |
| Regression | 5 | 2.70279 × 104 | 5.40557 × 103 | 38.498 | 0.18 ** | 5.09583 × 103 | 1.01916 × 103 | 42.163 | 0.15 ** | 0.2950 | 0.0590 | 17.47 | 0.80 ** |
| Residual SSE |
4 | 5.61648 × 102 | 1.40412 × 102 | 9.66891 × 101 | 2.41723 × 101 | 0.0135 | 0.0034 | ||||||
| Lack of fit SSLOF |
3 | 4.77654 × 102 | 1.59218 × 102 | 1.896 | 48.0 | 7.75867 × 101 | 2.58622 × 101 | 1.354 | 54.7 | 0.0117 | 0.0039 | 2.169 | 45.4 |
| Error SSPE |
1 | 8.39938 × 101 | 8.39938 × 101 | 1.91024 × 101 | 1.91024 × 101 | 0.0018 | 0.0018 | ||||||
| Total SS | 9 | 2.75895 × 104 | 5.19252 × 103 | 0.3085 | |||||||||