Source

Sum of Squares

Degree of freedom

Mean Square

F Value

P Value

Model

13.49

9

1.50

26.34

0.0001

Residual

0.40

7

0.057

   

Lack of Fit

0.23

3

0.076

1.77

0.2924

Pure Error

0.17

4

0.0

   

Total

14.29

23

     
Table 3: Analysis of variance (ANOVA) for the response surface quadratic model f or the extraction yield of Strobilanthes crispus.