| Age | Num. | Mean | Std. Deviations | |
Gender | Boy | 8 | 50 | 30.42 | 3.23 |
9 | 50 | 30.82 | 2.53 | ||
10 | 50 | 30.98 | 2.88 | ||
Total | 150 | 30.74 | 2.88 | ||
Girl | 8 | 50 | 29.32 | 3.33 | |
9 | 50 | 30.34 | 2.77 | ||
10 | 50 | 29.66 | 2.75 | ||
Total | 150 | 29.77 | 2.97 | ||
Age | Boy & Girl | 8 | 100 | 29.87 | 3.308 |
9 | 100 | 30.58 | 2.648 | ||
10 | 100 | 30.32 | 2.881 | ||
Total | 300 | 30.26 | 2.96 |