 |
| |||
| multi-phase sampling | |||
| multistage sampling | |||
| stratified sampling | |||
| 多 层抽样: 5 phrases in 4 subjects |
| Business | 1 |
| Marketing | 2 |
| Statistics | 1 |
| Technology | 1 |
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
| Get short URL | Language Selection Tips