Research Article
The Application of Response Surface Methodology in the Investigation of the Tribological Behavior of Palm Cooking Oil Blended in Engine Oil
Table 10
Estimated regression coefficients for wear rate.
| Term | Coef | SE Coef | -ratio | value |
| Constant | −0.783168 | 0.625581 | −1.252 | 0.299 | Speed | 0.008006 | 0.004209 | 1.902 | 0.153 | Load | 0.117524 | 0.052127 | 2.255 | 0.109 | Volume composition | −0.012697 | 0.022237 | −0.571 | 0.608 | Speed speed | −0.000009 | 0.000008 | −1.085 | 0.357 | Load load | 0.000042 | 0.001946 | 0.022 | 0.984 | Volume composition volume composition | 0.002760 | 0.000954 | 2.894 | 0.063 | Speed load | −0.000392 | 0.000144 | −2.718 | 0.073 | Speed volume composition | −0.000068 | 0.000101 | −0.673 | 0.549 | Load volume composition | 0.001647 | 0.000944 | 1.745 | 0.179 |
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