Source of variation SS df Mean square(MS) F-value P> F Model 53.85109 14 3.8465 4649.27 0.0000 Error 0.01241 15 0.0008273     Total 53.8635         df, degree of freedom; SS, sum of squares; F, factor F; P, probability. R2=0.99977; R2 (adj): 0.99955

Table 6: Analysis of variance (ANOVA) of lead biosorption for entire quadratic model.