Table 3.

Single response chemical process data generated from the Central Composite Design.

$i$	$x_1$	$x_2$	$y$
1	−1	−1	88.55
2	1	−1	85.80
3	−1	1	86.29
4	1	1	80.44
5	−1.414	0	85.50
6	1.414	0	85.39
7	0	−1.414	86.22
8	0	1.414	85.70
9	0	0	90.21
10	0	0	90.85
11	0	0	91.31

Source: see [27].