Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite

Table 4

Results for ANOVA for the model.

Source	Sum of squares	DF	Mean square	-value
Model	13.4078	6	2.23463	203.981	<0.0001
Residual	0.219102	20	0.010955
Lack of fit	0.21761	15	0.014507	48.6273	0.0002
Pure error	0.001492	5	0.000298
Cor. total	13.6269	26