Table 3.

Different sets of experiments for 15 trails of formulations with coded and actual values.

Run	X1		X2		X3
	Oil Concentration % w/w		Stirring Speed RPM		Surfactant Concentration
	Coded value	Actual value	Coded value	Actual value	Coded value	Actual value
1	0	15	1	18,000	1	3.5
2	1	20	1	18,000	0	2.5
3	1	20	0	14,000	−1	1.5
4	1	20	0	14,000	1	3.5
5	−1	10	1	18,000	0	2.5
6	0	15	−1	14,000	−1	1.5
7	0	15	1	18,000	−1	1.5
8	0	15	0	14,000	0	2.5
9	−1	10	0	14,000	−1	1.5
10	0	15	−1	10,000	1	3.5
11	−1	10	−1	10,000	0	2.5
12	1	20	−1	10,000	0	2.5
13	−1	10	0	14,000	1	3.5
14	0	15	0	14,000	0	2.5
15	0	15	0	14,000	0	2.5

Where 1 for the maximum level, 0 for the medium level and −1 for the minimum level.