Psychology / Unit 1 Psych 0090 short lesson, about 20 seconds
Assignment Is Not Sampling
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The idea
Random assignment builds the groups within a study; random sampling builds the sample from a population.
In practice
A campus study can assign perfectly at random and still describe only that campus.
Where people slip
A study can do one well and the other badly. Assignment protects causal claims; sampling protects generalization.
Your place on the trail
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