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Define non-probability sampling as it is used in psychological research and describe its primary limitation regarding population estimates.
Question: Define non-probability sampling as it is used in psychological research and describe its primary limitation regarding population estimates.
Sample answer: Non-probability sampling encompasses methods where the researcher cannot mathematically specify the probability that any given member of the target population will be selected for the sample. Its primary limitation is that, because it does not rely on structured random selection from a clearly defined population, it limits the ability to make perfectly representative population estimates.
Key points:
- Researcher cannot mathematically specify the probability of selection.
- Does not rely on structured random selection from a clearly defined population.
- Limits the ability to make perfectly representative population estimates.
Rubric: Award full credit if the student explicitly notes the inability to mathematically specify selection probability and identifies the limitation regarding perfectly representative population estimates.
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Research Methods in Psychology - 4th American Edition @ KPU
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