Source Sum of squares df Mean square F -Value P- value model 12060.48 1 861.46 1387.59 <0.0001 A-pH 914.15 1 914.15 1472.45 <0.0001 B-TCcon. 1730.94 1 1730.94 2788.08 <0.0001 C-PScon. 3999 1 3999 6441.32 <0.0001 D-Time 4676.04 1 4676.04 7531.85 <0.0001 AB 18.66 1 18.66 30.06 <0.0001 AC 30.97 1 30.97 49.88 <0.0001 AD 6.84 1 6.84 11.01 0.0047 BC 16.4 1 16.4 26.42 0.0001 BD 17.64 1 17.64 28.41 <0.0001 CD 16.61 1 16.61 26.75 0.0001 A2 571.64 1 571.64 920.76 <0.0001 B2 123.3 1 123.3 198.6 <0.0001 C2 29.96 1 29.96 48.26 <0.0001 D2 20.18 1 20.18 32.5 <0.0001 Residual 9.31 15 0.62 Lack of Fit 5.13 10 0.51 0.61 0.7607 Pure Error 4.18 5 0.84 Cor Total 12069.8 29