Table 2.

Full factorial BBD matrix of three variables in coded units and the experimentally observed response.

Runs	X 1	X 2	X 3	X 4	Extraction yield (%)
1	110	22	35	18	4.29
2	110	28	35	18	4.21
3	130	22	35	18	4.23
4	130	28	35	18	4.32
5	120	25	32	16	4.06
6	120	25	32	20	3.91
7	120	25	38	16	3.89
8	120	25	38	20	3.92
9	110	25	35	16	4.26
10	110	25	35	20	4.11
11	130	25	35	16	4.19
12	130	25	35	20	4.15
13	120	22	32	18	4.07
14	120	22	38	18	3.94
15	120	28	32	18	4.06
16	120	28	38	18	3.98
17	110	25	32	18	3.95
18	110	25	38	18	4.02
19	130	25	32	18	4.08
20	130	25	38	18	4.04
21	120	22	35	16	4.26
22	120	22	35	20	4.11
23	120	28	35	16	4.19
24	120	28	35	20	4.22
25	120	25	35	18	4.37
26	120	25	35	18	4.36
27	120	25	35	18	4.35