| |||
| простая выборка | |||
| однократная выборка | |||
|
simple sample : 7 phrases in 4 subjects |
| Ecology | 1 |
| Mathematics | 3 |
| Quality control and standards | 2 |
| Water supply | 1 |
| |||
| простая выборка | |||
| однократная выборка | |||
|
simple sample : 7 phrases in 4 subjects |
| Ecology | 1 |
| Mathematics | 3 |
| Quality control and standards | 2 |
| Water supply | 1 |