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This is when the population sampled is not exactly the population of interest.

E.g., If there was a questionnaire that's based on NZ women, the

population is focused on NZ WOMEN.

If the questionnaire was posted in a magazine, women are able to answer it EXCEPT this does not representthe population of NZ WOMEN

because only women who READ magazines could take part of the survey.

This is called selection bias in which only a sample of New Zealand Women participate in the survey which obviously does not represent a WHOLE POPULATION.

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Q: What is Selection bias in statistics?
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