Discussion
Which one of the following is not a probability sampling method ?
Answer: D
The one that is not a probability method is Quota Sampling.
In quota sampling the researcher fixes how many respondents of each category (for example so many men and women) are needed and then fills the quotas by choosing whoever is available. Since the selection is not random, the chance of each unit being chosen is unknown, which makes it non-probability sampling.
Simple random, cluster and stratified random sampling all give every unit a known, non-zero chance of selection, so they are probability methods.
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