Source Sum of Squares   df Mean Square F Value p-value Prob>F
Model 743801.02 9 82644.55 507.67 <0.0001
X1- Soluble starch 39734.13 1 39734.13 244.078 <0.0001
X2-Ferrous iron 33242.54 1 33242.54 204.2 <0.0001
X3-L-cystein 10372.44 1 10372.44 63.72 <0.0001
X1X2 903.13 1 903.13 5.55 0.0403
X1X3 17578.13 1 17578.13 107.98 <0.0001
X2X3 903.13 1 903.13 5.55 0.0403
X1^2 99463.50 1 99463.50 610.98 <0.0001
X2^2 208665.97 1 208665.96 1281.79 <0.0001
X3^2 332938.06 1 332938.06 2045.16 <0.0001
Residual 1627.93 10 162.79    
Lack of Fit 786.59 5 157.32 0.93 0.5285
Pure Error 841.33 5 168.27   <0.0001
Cor Total 745428.95 19     <0.0001
R-Squared: 0.9978 Adj R-Squared: 0.9959 Pred R-Squared: 0.9899 Adeq Precission: 68.109

Table 3: ANOVA for response surface quadratic model for hydrogen production.