From the ANOVA table as shown in Table 4, it is seen that all the
three reaction parameters are significant with catalyst loading
being the most significant one having an F-value of 447.54. The
model F-value of 369.22 implies that the model is significant.
There is only a 0.01% chance that a model F-value of this large could occur
due to noise. The value of ‘‘Prob.>F’’ less than 0.0500 indicate
model terms are significant. In this case, X1, X2, X3, X1 2 , X2 2 and X3 2
are significant model terms. Thus the interactions between the
process variables do not affect the yield much. The examination
of the fit summary output revealed that the quadratic model is statistically
significant for the response and therefore it will be used
for further analysis. The ‘‘Predicted R-squared’’ value of 0.9321 is