Chapter Fifteen. Sampling and Sample Size. Sampling. A sample represents a microcosm of the population you wish to study
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Non-probability samples do not provide an equal or a known chance of being selected
Quota Sample: the parallel here is the stratified sample; a quota sample requires that a certain number be selected in each category--usually done on a first-come first included basis. Sampling stops when enough are included in each category
Snowball Sampling: also known as “referral sampling”.
Used on hard to locategroups that one cannot obtain a list of the individuals who possess the attributes or phenomenon you wish to study; e.g. blind, those with some sort of disability, “closet” homosexuals, etc