Table 2.
ANOVA analysis for response surface model
| Source | Degree of freedom | Adjusted sum of square | Adjusted mean square | F-value | p-value |
|---|---|---|---|---|---|
| Model | 5 | 6853.04 | 1370.61 | 175.53 | <0.001 |
| Linear | 2 | 607.84 | 303.92 | 38.92 | <0.001 |
| AgNO3 concentration | 1 | 183.21 | 183.21 | 23.46 | 0.002 |
| pH | 1 | 424.63 | 424.63 | 54.38 | <0.001 |
| Square | 2 | 5020.19 | 2510.10 | 321.47 | <0.000 |
| AgNO3 | 1 | 1437.50 | 1437.50 | 184.10 | <0.000 |
| concentration*AgNO3 | |||||
| concentration | |||||
| pH*pH | 1 | 4133.15 | 4133.15 | 529.34 | <0.000 |
| 2-way interaction | 1 | 1225.00 | 1225.00 | 156.89 | <0.000 |
| AgNO3 concentration*pH | 1 | 1225.00 | 1225.00 | 156.89 | <0.000 |
| Error | 7 | 54.66 | 7.81 | ||
| Lack-of-fit | 3 | 54.66 | 18.22 | Undefined | Undefined |
| Pure error | 4 | 0.00 | 0.00 | ||
| Total | 12 | 6907.69 |