Steekproef. Populatie en steekproefproportie
Steekproef, polulatie en steekproefproportie
- Target Group (Age)
- 12 – 19+
- Language
- Dutch / Nederlands (België)
Error
A timeout occurred. Trying to re-save …
Sorry, but the server is not responding. Please wait a few minutes and then try to save again.
