Discussion
Which one of the following is a non-probability sampling method ?
Answer: D
The non-probability method is purposive sampling.
In purposive (judgement) sampling the researcher deliberately picks cases thought to be typical or informative. Because selection depends on judgement, not every member of the population has a known chance of being chosen, which is what makes it non-probability sampling.
Simple random, stratified and cluster sampling are all probability methods: every unit, or every cluster, has a known, non-zero chance of selection, chosen by a random process within the population, the strata or the clusters.
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