Table 5. ANOVA Results for the Quadratic Model.
| source | sum of squares | df | mean square | F-value | p-value | significance |
|---|---|---|---|---|---|---|
| model | 2398.11 | 9 | 266.46 | 1001.90 | <0.0001 | significant |
| A—temperature | 267.61 | 1 | 267.61 | 1006.25 | <0.0001 | significant |
| B—molar ratio(Alco:Oil) | 387.53 | 1 | 387.53 | 1457.16 | <0.0001 | significant |
| C—catalyst weight | 163.35 | 1 | 163.35 | 614.22 | <0.0001 | significant |
| AB | 7.48 | 1 | 7.48 | 28.13 | 0.0011 | significant |
| AC | 230.74 | 1 | 230.74 | 867.59 | <0.0001 | significant |
| BC | 9.21 | 1 | 9.21 | 34.64 | 0.0006 | significant |
| A2 | 200.55 | 1 | 200.55 | 754.09 | <0.0001 | significant |
| B2 | 310.98 | 1 | 310.98 | 1169.30 | <0.0001 | significant |
| C2 | 692.17 | 1 | 692.17 | 2602.63 | <0.0001 | significant |
| residual | 1.86 | 7 | 0.2660 | |||
| lack of fit | 1.17 | 3 | 0.3893 | 2.24 | 0.2254 | not significant |
| pure error | 0.6939 | 4 | 0.1735 | |||
| cor total | 2399.97 | 16 | ||||
| std. dev. | 0.5157 | R2 | 0.9992 | |||
| mean | 65.21 | adjusted R2 | 0.9982 | |||
| C.V. % | 0.7908 | predicted R2 | 0.9918 | |||
| adeq precision | 95.1149 | |||||
| significant when p ≤ 0.05, and insignificant when p > 0.05 | ||||||