Exp. #

H

(1)

(2)

(3)

Divisor

Estimate

Identific

13

54.75

110.58

235.75

634.18

8

79.27

Average

14

55.83

125.17

398.43

-11.56

4

-2.89

X

15

68.72

199.62

-11.19

13.78

4

3.45

Y

16

56.45

198.81

-0.37

-13.40

4

-3.35

(X)(Y)

17

99.89

1.08

14.59

162.68

4

40.67

Z

18

99.73

-12.27

-0.81

10.82

4

2.71

(X)(Z)

19

99.51

-0.16

-13.35

-15.40

4

-3.85

(Y)(Z)

20

99.30

-0.21

-0.05

13.30

4

3.32

(X)(Y)(Z)

H = Percentage of biodegradation detected after 72 h (average of duplicate experiments).
The Estimate indicates the magnitude of each variable and interaction.
Standard deviation = 2.65;   Significance level = 95%    Acceptance area = ± 3.06 .
Therefore, the effects with a magnitude outside the acceptance area are significant (P<0.05).