Table 1.
Surface share of abrasive depending on type of particle, pressure and size of grain-Dunn’s test.
| Descriptive Statistics | Particles | Pressure (Mpa) | Grain Size (μm) | ||||
|---|---|---|---|---|---|---|---|
| Al2O3 | SiC | 0.2 | 0.35 | 250 | 110 | 60 | |
| Arithmetic mean | 7.10 | 3.29 | 4.56 | 5.83 | 4.99 | 4.51 | 6.085 |
| Median | 7.02 | 2.84 | 4.35 | 5.91 | 3.17 | 4.10 | 6.385 |
| Standard deviation | 2.34 | 1.59 | 2.06 | 3.21 | 3.62 | 2.78 | 1.0344 |
| Minimum | 2.93 | 1.21 | 1.63 | 1.21 | 1.86 | 1.21 | 4.19 |
| Maximum | 11.86 | 7.01 | 7.94 | 11.86 | 11.86 | 8.57 | 7.94 |
| Lower Quartile < 0 | 6.38 | 1.96 | 2.52 | 3.08 | 2.84 | 1.80 | 5.1175 |
| Upper quartile | 7.91 | 4.75 | 6.61 | 7.79 | 5.49 | 7.14 | 6.945 |
| Test statistics | Z = 7.9545 | Z = 1.9525 | H = 9.8445 | ||||
| p | p < 0.0001 | p = 0.0509 | p = 0.0073 | ||||
| Dunn’s test (post-hoc) |
Grain size (μm) | 250 | 0.7237 | 0.0116 | |||
| 110 | 0.7237 | 0.0040 | |||||
| 60 | 0.0116 | 0.0040 | |||||