(a).
| Source | Pectin yield (%) | DE (%) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Df | Sum sq | Mean sq | F value | Pr (>F) | Df | Sum sq | Mean sq | F value | Pr (>F) | |
| Model | 9 | 584.37 | 64.93 | 6.08 | 0.0306∗ | 9 | 156.22 | 17.36 | 4.24 | 0.0631 |
| Linear | 3 | 443.10 | 147.70 | 13.82 | 0.0074∗∗ | 3 | 17.52 | 5.84 | 1.43 | 0.3911 |
| Interaction | 3 | 35.57 | 11.86 | 1.11 | 0.4274 | 3 | 67.34 | 22.45 | 5.48 | 0.0488∗ |
| Square | 3 | 105.70 | 35.23 | 3.30 | 0.1159 | 3 | 71.36 | 23.79 | 5.81 | 0.0438∗ |
| Residuals | 5 | 53.44 | 10.69 | 5 | 20.48 | 4.10 | ||||
| Lack of fit | 3 | 51.92 | 17.31 | 22.77 | 0.0424 | 3 | 19.00 | 6.33 | 8.61 | 0.1058 |
| Pure error | 2 | 1.52 | 0.76 | 2 | 1.47 | 0.74 | ||||
| Total | 28 | 1275.62 | 28 | 353.39 | ||||||