Psychology / Unit 1 Psych 0085 short lesson, about 20 seconds
The Experiment
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The idea
An experiment manipulates one variable, holds others constant, and measures the effect, which is what licenses a causal claim.
In practice
Researchers assign one group to sleep eight hours and another to sleep five, then test both on the same recall task.
Where people slip
The experiment is the only common design that supports a causal conclusion. Every other design describes.
Your place on the trail
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Builds on
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