Source Sum of square Df Mean square F-Value P-value         
 Prob>F
Model 637.43 5 127.49 0.17 0.9665 (Non siginificant)         not significant
X1 242.70 1 242.70 0.32 0.5893
X2 277.98 1 277.98 0.37 0.5640
X1X2 29.21 1 29.21 0.039 0.8500
X12 15.18 1 15.18 0.020 0.8915
X22 87.40 1 87.40 0.12 0.7442
Residual 5309.09 7 758.4 0.049  
Lack of fit 188.86 3 62.95   0.9836 (Not significant)
Pure error 5120.23 4 1280.06    
Table 5: ANOVA for response surface quadratic model of gross energy value of pre-dried smoked Nile Tilapia.