Table 3: ANOVA quadratic model for lead.

SourceSum of squaresDOFMean square value value

Model3152.459350.274.430.0312Significant
A-CD650.521650.528.230.0240
B-solvent434.981434.985.510.0514
C-time330.121330.124.180.0802
AB6.1016.100.07720.7891
AC0.115610.11560.00150.9706
BC204.631204.632.590.1516
A21459.6111459.6118.470.0036
B211.76111.760.14890.7111
C213.89113.890.17580.6876
Residual553.05779.01
Lack of fit541.643180.5563.270.0008Significant
Pure error11.4142.85
Total3705.5016