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Table 1 Analysis of variance of the effect of the aqueous extract of Acacia fruit and duration of treatment on the corrosion inhibition of bronze

From: The use of Robinia pseudoacacia L fruit extract as a green corrosion inhibitor in the protection of copper-based objects

Source

df

SS

MS

F

Concentration of extract

8

33,320.9

4165.11

134.50**

r

3

197.9

65.96

 

Error r* Concentration of extract

24

743.2

30.97

 

Week (period of time)

3

11,575.7

3858.58

157.28**

Concentration of extract *week

24

16,934.4

705.60

28.76**

Error r* Concentration of extract *week

81

1987.2

24.53

 

Total

143

64,759.3

  

CV(r* concentration)

8.12

CV(r* concentration *week)

7.23

  1. **Significant at one percent level
  2. df: Degrees of freedom; SS: sum of Squares; MS: mean sum of squares; F ratio: each F ratio is computed by dividing the MS value by another MS value. The MS value for the denominator depends on the experimental design