Table 8: The % of contribution of the parameters to the flexural strength along with the estimated ANOVA parameter.

Parameter “Sum of squaresDegree of freedomMean sum of squares statistics tabulated% of contribution

10.7525.37582.6923.88
20.3210.15156.15*9945.09
13.8426.92106.45*30.75

Error0.1320.0650.28

Total45.02822.507

Significance at 99% confidence level ( statistics > tabulated).