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Probability and non-probability sample

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Discuss the differences between a probability and a non-probability sample. Under what circumstances would each be used?

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This posting discusses the differences between a probability and a non-probability sample and the circumstances under which each would be used.

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The difference between probability and non-probability sampling has to do with a basic assumption about the nature of the population under study. In probability sampling, every item has a chance of being selected. In non-probability sampling, there is an assumption that there is an even distribution of characteristics within the population. This is what makes the researcher believe that any sample would be representative and because of that, results ...

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