Table 6.

Analysis of variance of the model for carotenoids production

Source	Sum of squares	df	Mean square	F value	P value
x 1	0.0008	1	0.0008	6.25	0.12
x 2	0.02	1	0.02	188.48	<0.05
x 3	0.003	1	0.003	25	<0.05
x 4	0.014	1	0.014	105.06	<0.05
x 1 x 2	0.004	1	0.004	31.68	<0.05
x 1 x 3	0.0002	1	0.0002	1.68	0.32
x 1 x 4	0.0001	1	0.0001	0.75	0.47
x 2 x 3	0.01	1	0.01	75.00	<0.05
x 2 x 4	0.001	1	0.001	12.00	0.07
x 3 x 4	0.0006	1	0.0006	4.68	0.16
x 1 2	0.005	1	0.005	43.34	<0.05
x 2 2	0.002	1	0.002	21.77	<0.05
x 3 2	0.005	1	0.005	41.17	<0.05
x 4 2	0.0003	1	0.0003	2.77	0.23
Lack of fit	0.005	10	0.0005	3.89	0.22
Pure error	0.0002	2	0.0001
Total	0.10	26

R² = 0.95