| GRADE | Sum of Squares | df | Mean Square | F | Sig. |
| Between Groups | 43,794.414 | 1 | 43,794.414 | 4.802 | 0.032 |
| Within Groups | 601,942.219 | 66 | 9120.337 |
|
|
| Total | 645,736.632 | 67 |
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