Sociology / Unit 2 Soc 0159 short lesson, about 20 seconds
The Random Sample
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The idea
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.
In practice
Stratified sampling draws within subgroups; cluster sampling selects whole groups at random — both generalize legitimately without equal individual odds.
Where people slip
Convenience sampling — whoever answered — is not probability sampling, whatever the sample size.
Your place on the trail
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Builds on
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