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Table 4 Analysis of variance (ANOVA) of A. niveus for the fitted quadratic polynomial model for residual tannic acid and chromium

From: Optimization of chromium and tannic acid bioremediation by Aspergillus niveus using Plackett–Burman design and response surface methodology

Response variable Source Sum of squares Degree of freedom Mean square F value P value prob > F
Tannic acid Model 5956.30 14 425.45 72757.21 < 0.0001a
Lack of fit 0.064 9 7.149E−003 2.45 0.2016b
Pure error 0.012 4 2.920E−003   
Cor total 5956.38 27    
Chromium Model 259.18 14 18.51 8.73 < 0.0002a
Lack of fit 13.13 9 1.46 0.40 0.8804b
Pure error 14.42 4 3.60   
Cor total 286.73 27    
  1. aSignificant
  2. bNon significant