Table 2

Run	Coded variable levels				Observed (Y₁)	Predicted (Y₀)
Run	x₁	x₂	x₃	x₄	Observed (Y₁)	Predicted (Y₀)
1	-1	-1	-1	-1	39.05	37.90
2	1	-1	-1	-1	51.75	52.57
3	-1	1	-1	-1	42.72	37.12
4	1	1	-1	-1	42.8	47.89
5	-1	-1	1	-1	39.93	44.40
6	1	-1	1	-1	63.0	59.07
7	-1	1	1	-1	45.04	43.63
8	1	1	1	-1	54.73	58.30
9	-1	-1	-1	1	45.45	42.61
10	1	-1	-1	1	58.12	57.28
11	-1	1	-1	1	40.5	41.84
12	1	1	-1	1	54.03	56.51
13	-1	-1	1	1	35.3	34.38
14	1	-1	1	1	40.11	48.27
15	-1	1	1	1	39.6	33.61
16	1	1	1	1	50.53	48.28
17	-2	0	0	0	17.01	23.76
18	2	0	0	0	61.28	53.09
19	0	-2	0	0	60.5	58.92
20	0	2	0	0	57.22	57.36
21	0	0	-2	0	44.62	45.26
22	0	0	2	0	49.63	44.40
23	0	0	0	-2	47.33	47.91
24	0	0	0	2	39.11	42.61
25	0	0	0	0	44.62	45.26
26	0	0	0	0	44.61	45.26
27	0	0	0	0	44.63	45.26
28	0	0	0	0	44.62	45.26
29	0	0	0	0	44.63	45.26
30	0	0	0	0	44.64	45.26

Table 2: Central Composite Design with the observed responses and predicted values for inulin yield (%).