Table 11 ANOVA results for compressive strength at 28 days.
ANOVA for the Quadratic Model | ||||||
|---|---|---|---|---|---|---|
Source | Sum of Squares | df | Mean square | F-value | p-value | Remarks |
Model | 274.63 | 5 | 54.93 | 105.45 | < 0.0001 | significant |
A- EMS Dosages | 69.82 | 1 | 69.82 | 134.04 | < 0.0001 | significant |
B- RHA Dosages | 0.0227 | 1 | 0.0227 | 0.043 | 0.8367 | not significant |
AB | 1.21 | 1 | 1.21 | 2.32 | 0.1427 | not significant |
A2 | 6.00 | 1 | 6.00 | 11.52 | 0.0027 | significant |
B2 | 2.83 | 1 | 2.83 | 5.44 | 0.0297 | significant |
Lack of fit | 0.51 | 6 | 0.08 | 0.12 | 0.9934 | not significant |
Fit Statistics | ||||||
R2 0.96 Remarks: The quadratic Model is significant to proceed with the design. | ||||||
Adjusted R2 0.95 | ||||||
Predicted R2 0.94 | ||||||
Adeq. Precision 25.91. | ||||||
