Table 2.
Shows the means of surface roughness values of three different groups with their respective standard deviations
| Company | Group | Mean | N | Standard Deviation |
|---|---|---|---|---|
| Ivoclar | Autoglazed | .1470 | 10 | .00483 |
| Reglazed | .1190 | 10 | .00876 | |
| Chair-side polished | .1220 | 10 | .00422 | |
| Total | .1293 | 30 | .01413 | |
| Vita | Autoglazed | .1440 | 10 | .00516 |
| Reglazed | .1140 | 10 | .00966 | |
| Chair-side polished | .1180 | 10 | .00632 | |
| Total | .1253 | 30 | .01525 | |
| Total | Autoglazed | .1455 | 20 | .00510 |
| Reglazed | .1165 | 20 | .00933 | |
| Chair-side polished | .1200 | 20 | .00562 | |
| Total | .1273 | 60 | .01471 |