| Level of study | Desired sample per class | Number studied |
|---|---|---|
| 1 | 130 *300/681 | 57 |
| 2 | 126*300/681 | 56 |
| 4 | 297*300/681 | 131 |
| 5 | 128*300/681 | 56 |
| Total | 57+56+131+56 | 300 |
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