Table 2: Analysis of variance (ANOVA) for yield in the experimental design (residual error).

Source of
Variation
Sum of
Squares
Degrees of
Freedom
Medium
Square
Fcalc Ftable
First order model
Regression 169.71 3 56.57 34.70 9.28
Residue 4.89 3 1.63
Total 174.60 6 -
Second order model
Regression 180.25 5 36.05 5.32 5.05
Residue 33.85 5 6.77
Total 214.10 10 -