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Table 3 ANOVA for the yield and adsorption capacity of DGPAC

From: Screening of factors that influence the preparation of Dialium guineense pods active carbon for use in methylene blue adsorption: a full factorial experimental design

Source DF Adj SS Adj MS F-value P-value
Yield of DGPAC
Model 3 406.78 135.595 30.45 0.001
A: [Activating agent] 1 292.58 292.578 65.71 0.000
B: Activation time (min) 1 85.02 85.021 19.09 0.005
AB 1 29.18 29.185 6.55 0.043
Curvature 1 11.69 11.686 3.89 0.106
Error 6 26.72 4.453   
Total 9 433.50    
S: 2.11010, R2: 93.84%, R2(adj): 90.76%, R2(pred): 86.11%
Source DF Adj SS Adj MS F-value P-value
Adsorption capacity of DGPAC for methylene blue
Model 7 71.5369 10.2196 1493.55 0.001
A: [Activating agent] 1 45.5371 45.5371 6655.07 < 0.001
B: Activation time (min) 1 0.0241 0.0241 3.52 0.202
C: Activating agent 1 13.3789 13.3789 1955.27 0.001
AB 1 1.6247 1.6247 237.44 0.004
AC 1 2.1878 2.1878 319.74 0.003
BC 1 0.9438 0.9438 137.93 0.007
Curvature 1 7.8406 7.8406 1145.87 0.001
Error 2 0.0137 0.0068   
Total 9 71.5506    
S: 0.0827193, R2: 99.98%, R2(adj): 99.91%, R2(pred): 99.72%
  1. DF, degrees of freedom; Adj.SS, adjusted sum of squares; Adj MS, adjusted mean of squares; F-value, Fisher’s test value; P-value, probability value