Table 3 Sequential model sum of squares and ANOVA for response surface linear model for essential oil extraction

Mean

56.74

1

56.74

–

–

Linear

4.98

2

2.49

11.59

0.0025

Suggested

2FI

2.500E−003

1

2.500E−003

0.01

0.9207

Quadratic

0.62

2

0.31

1.43

0.3006

Cubic

0.11

2

0.06

0.20

0.8229

Aliased

Residual

1.41

5

0.28

–

–

Total

63.87

13

4.91

–

–

Model

4.98

2

2.49

11.59

0.0025

A

1.46

1

1.46

6.78

0.0263

B

3.52

1

3.52

16.40

0.0023

Residual

2.15

10

0.21

–

–

Lack of fit

2.13

6

0.36

91.80

0.0003

Pure error

0.015

4

3.870E−003

–

–

Correlation total

7.12

12

–

–

–