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Is a simple random sample (always, sometimes, or never true) valid and why?

User Bluppfisk
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SOmetimes valid.  What if you take a random sample from a population that is 100% Republican?  Then your answers will not be a good representation of the whole US population, only those people from that area.  So your sample has to be a good representation for a random sample to be valid.
User Dondon Jie
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