| N | Mean | Std. Deviation | Std. Error | F | Sig. |
Casual Worker | 1070 | 32.9981 | 9.61835 | 0.29404 | 1.218 | 0.296 |
Technical Staff | 108 | 31.5648 | 9.30307 | 0.89519 | ||
Engineer | 60 | 32.2500 | 9.21058 | 1.18908 | ||
Total | 1238 | 32.8368 | 9.57399 | 0.27210 |