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Table 5 The application of regression and ANOVA tests for fluoride removal

From: Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Variables Coefficients symbol Coefficients Standard error t Stat p-value
Intercept b0 64.70 7.32 8.83 3.73E−08
X1 b1 12.21 5.40 2.26 0.036
X2 b2 − 3.37 0.75 − 4.49 0.000
X3 b3 − 0.05 0.08 − 0.56 0.580
X1X2 b4 − 0.03 0.20 − 0.13 0.897
X1X3 b5 − 0.04 0.07 − 0.67 0.513
X2X3 b6 0.01 0.01 1.02 0.319
X1X2X3 b7 − 0.02 0.01 − 0.38 0.711
Regression statistics Multiple R R square Adjusted R square Standard error Observations
  0.96 0.92 0.89 2.99 27
ANOVA df SS MS F Significance F
Regression 7 1965.85 280.84 31.49 3.71E−09
Residual 19 169.43 8.92   
Total 26 2135.28