Relevance of the Physicochemical Properties of Calcined Quail Eggshell (CaO) as a Catalyst for Biodiesel Production

Table 2

Matrix of the experimental designs    and Box-Behnken. Data are presented as mean ± standard deviation, .

Run	Coded variables			Real variables			Response
	1	−1	−1	0	1 : 9	2.0	2.5	87.88 ± 0.01
2	1	−1	0	1 : 12	2.0	2.5	88.16 ± 0.07
3	−1	1	0	1 : 9	3.0	2.5	91.18 ± 0.30
4	1	1	0	1 : 12	3.0	2.5	89.39 ± 0.02
5	−1	0	−1	1 : 9	2.5	2.0	88.61 ± 0.04
6	1	0	−1	1 : 12	2.5	2.0	86.72 ± 0.13
7	−1	0	1	1 : 9	2.5	3.0	91.67 ± 0.02
8	1	0	1	1 : 12	2.5	3.0	98.35 ± 0.02
9	0	−1	−1	1 : 10.5	2.0	2.0	99.00 ± 0.20
10	0	1	−1	1 : 10.5	3.0	2.0	72.53 ± 0.40
11	0	−1	1	1 : 10.5	2.0	3.0	87.17 ± 0.03
12	0	1	1	1 : 10.5	3.0	3.0	88.29 ± 0.01
13	0	0	0	1 : 10.5	2.5	2.5	76.74 ± 0.09
14	0	0	0	1 : 10.5	2.5	2.5	76.80 ± 0.14
15	0	0	0	1 : 10.5	2.5	2.5	75.56 ± 0.90