Question: What's Random Random Assignment to Treatments No Random Assignment to Treatments Subjects Randomly Sampled from Population 8 Subjects not Randomly Sampled from Population Confounding not

What's Random Random Assignment to Treatments No Random Assignment to Treatments Subjects Randomly Sampled from Population 8 Subjects not Randomly Sampled from Population Confounding not addressed; results don't generalize beyond sample Confounding addressed; so solid claim for causation with results?

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