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| opinion research (1) |
| response behavior (1) |
| sample (1) |
| Stichprobe (1) |
| survey research (1) |
| Telefoninterview (1) |
| telephone interview (1) |
| Umfrageforschung (1) |
| weighting (1) |
| opinion research (1) |
| response behavior (1) |
| sample (1) |
| Stichprobe (1) |
| survey research (1) |
| Telefoninterview (1) |
| telephone interview (1) |
| Umfrageforschung (1) |
| weighting (1) |