Table 3.

ANOVA table.

Source	SS	df	MS	F	p
Regression	2.051	14	0.147	3.940	0.014
x 1	0.032	1	0.032	0.856	0.375
x 1 2	0.020	1	0.020	0.547	0.475
x 2	0.069	1	0.069	1.860	0.200
x 2 2	0.399	1	0.399	10.739	0.007
x 3	0.011	1	0.011	0.309	0.590
x 3 2	0.315	1	0.315	8.464	0.014
x 4	0.057	1	0.057	1.541	0.240
x 4 2	0.221	1	0.221	5.939	0.033
x 1 · x2	0.018	1	0.018	0.496	0.496
x 1 · x3	0.026	1	0.026	0.695	0.422
x 1 · x4	0.020	1	0.020	0.538	0.479
x 2 · x3	0.591	1	0.591	15.888	0.002
x 2 · x4	0.008	1	0.008	0.203	0.661
x 3 · x4	0.007	1	0.007	0.183	0.678
Residual error	0.409	11	0.037
Lack of fit	0.4088	10	0.041	158.327	0.062
Pure error	0.0002	1	0.0002
Total	2.460	25

SS: sum of squares; df: degree of freedom; MS: mean square; F: Fisher report; p: p value.