| N | Mean | Std. Deviation | Std. Error | F | Sig. |
Casual Worker | 1070 | 24.4178 | 7.35536 | 0.22486 | 1.763 | 0.172 |
Technical Staff | 108 | 23.6759 | 6.76001 | 0.65048 | ||
Engineer | 60 | 25.8833 | 7.38549 | 0.95346 | ||
Total | 1238 | 24.4241 | 7.31165 | 0.20780 |