Table 6.

The Box-Behnken design used for the three independent variables

Run	X 1	X 2	X 3	Actual response (%)	Predicted response (%)		Run	X 1	X 2	X 3	Actual response (%)	Predicted response (%)
1	−1	−1	0	48.40	45.87		24	0	−1	−1	37.60	33.09
2	1	−1	0	49.20	46.89		25	0	1	−1	3.80	3.27
3	−1	1	0	20.90	16.05		26	0	−1	1	42.90	49.96
4	1	1	0	9.60	17.07		27	0	1	1	21.60	20.14
5	−1	0	−1	23.00	28.63		28	0	0	0	62.00	64.77
6	1	0	−1	25.80	29.65		29	0	0	0	63.50	64.77
7	−1	0	1	37.00	45.51		30	0	0	0	69.60	64.77
8	1	0	1	50.35	46.52		31	−1	−1	0	44.40	45.87
9	0	−1	−1	34.80	33.09		32	1	−1	0	53.90	46.89
10	0	1	−1	2.40	3.27		33	−1	1	0	24.60	16.05
11	0	−1	1	42.20	49.96		34	1	1	0	18.90	17.07
12	0	1	1	22.10	20.14		35	−1	0	−1	42.40	28.63
13	0	0	0	67.00	64.77		36	1	0	−1	22.60	29.65
14	0	0	0	63.30	64.77		37	−1	0	1	47.00	45.51
15	0	0	0	65.10	67.77		38	1	0	1	51.75	46.52
16	−1	−1	0	32.40	45.87		39	0	−1	−1	38.20	33.09
17	1	−1	0	49.80	46.89		40	0	1	−1	4.80	3.27
18	−1	1	0	13.80	16.05		41	0	−1	1	53.70	49.96
19	1	1	0	11.80	17.07		42	0	1	1	15.35	20.14
20	−1	0	−1	23.40	28.63		43	0	0	0	67.50	64.77
21	1	0	−1	25.20	29.65		44	0	0	0	61.10	64.77
22	−1	0	1	50.95	45.51		45	0	0	0	63.90	64.77
23	1	0	1	51.55	46.52