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It is when you specifically choose the people that you "sample", in order to collect data about them. (As opposed to picking numbers representing people out of a hat, etc... ). For example, if you wanted to collect some sort of data from every male currently living within the same postcode as yourself, that would be nonrandom.

"Non-random" varies a lot depending on what you're actually sampling. What would be "random" in one context can be "nonrandom" in another.

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Q: What is nonrandom sampling?
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