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Table 5

ANOVA for analysis of variance and adequacy of the quadratic model

Sum of squaresF-ValueP-value Prob>F
Model 123.15 19.65 <0.0001 
A-pH 1,158.37 184.87 <0.0001 
B-Temperature 25.52 4.07 0.0632 
C-CBZ 70.08 11.18 0.0048 
D-Adsorbent 51.25 8.18 0.0126 
AB 21.16 3.38 0.0874 
AC 47.61 7.60 0.0154 
AD 8.12 1.30 0.2740 
BC 0.16 0.026 0.8753 
BD 0.063 9.975E-003 0.9219 
CD 73.96 11.80 0.0040 
A2 174.55 27.86 0.0001 
B2 47.73 7.62 0.0153 
C2 0.26 0.041 0.8417 
D2 3.90 0.62 0.4435 
Residual 87.72   
Lack of fit 86.92 43.46 0.0012 
Pure error 0.7   
Sum of squaresF-ValueP-value Prob>F
Model 123.15 19.65 <0.0001 
A-pH 1,158.37 184.87 <0.0001 
B-Temperature 25.52 4.07 0.0632 
C-CBZ 70.08 11.18 0.0048 
D-Adsorbent 51.25 8.18 0.0126 
AB 21.16 3.38 0.0874 
AC 47.61 7.60 0.0154 
AD 8.12 1.30 0.2740 
BC 0.16 0.026 0.8753 
BD 0.063 9.975E-003 0.9219 
CD 73.96 11.80 0.0040 
A2 174.55 27.86 0.0001 
B2 47.73 7.62 0.0153 
C2 0.26 0.041 0.8417 
D2 3.90 0.62 0.4435 
Residual 87.72   
Lack of fit 86.92 43.46 0.0012 
Pure error 0.7   
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