The related web sites give a good idea of the types of non-random sampling. These include snowball, convenience, quota, self-selection, diversity, expert, and others. Non-randon sampling is usually done because it is less expensive, easier, and quicker than random sampling.
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Non probability sampling and probability sampling are different because probability sampling uses random samples. Non probability sampling aren't random, but can still be representative of the population as a whole if done correctly.
random
It is not!
sampling techniques? okey, here's what to do... step 1go to google then type whatver you want to rsearch on. step2 read what has come up on wiki answers then i dont know
population -group statistically sampled.