Table 3 ANOVA for dependent variable: Fe content in biomass.

From: Medium optimization to improve growth and iron uptake by Bacillus tequilensis ASFS1 using fractional factorial designs

Source of variation

Sum of square

df

Mean of square

F value

P > F

Model

18,317.44

7

2616.78

8.42

0.0016

X1

280.56

1

280.56

0.90

0.3645

X2

501.76

1

501.76

1.61

0.2327

X3

1380.12

1

1380.12

4.44

0.0614

X4

1958.06

1

1958.06

6.30

0.0309

X5

10,070.12

1

10,070.12

32.39

0.0002

X1 X2

1870.56

1

1870.56

6.02

0.0341

X3 X4

2256.25

1

2256.25

7.26

0.0225

Curvature

472.44

1

472.44

1.52

0.2459

Residual

3108.97

10

310.90

  

Lack of Fit

3108.83

8

388.60

5551.48

0.0002

Pure Error

0.14

2

0.070

  

Cor Total

21,898.85

18