Sociology / Soc 0159 · Atom · ~20 seconds
The Random Sample
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Probability sampling selects members with a known, nonzero chance of selection; a simple random sample is the special case where that chance is equal for all.
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Stratified sampling draws within subgroups; cluster sampling selects whole groups at random — both generalize legitimately without equal individual odds.
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Convenience sampling — whoever answered — is not probability sampling, whatever the sample size.