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Psychology  /  Psych 0085  ·  Atom · ~20 seconds

The Experiment

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An experiment manipulates one variable, holds others constant, and measures the effect, which is what licenses a causal claim.

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Researchers assign one group to sleep eight hours and another to sleep five, then test both on the same recall task.

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The experiment is the only common design that supports a causal conclusion. Every other design describes.