The Application of Response Surface Methodology in the Investigation of the Tribological Behavior of Palm Cooking Oil Blended in Engine Oil

Table 3

Design values obtained from a Minitab.

Experiment	Speed (rev/min)	Load (kg)	Volume concentration (%)
1	300	5.5	10
2	300	2	5
3	200	9	5
4	250	2	10
5	250	5.5	5
6	200	5.5	10
7	250	9	0
8	250	2	0
9	300	5.5	0
10	300	9	5
11	250	5.5	5
12	250	9	10
13	200	2	5
14	200	5.5	0
15	250	5.5	5