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Psychology / Unit 7   Psych 0818 short lesson, about 20 seconds

Why Consistency Persuades

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The idea

Consistency is easier to demonstrate than validity and more persuasive to observers, which is what makes a reliable invalid measure dangerous.

In practice

A test producing the same score twice looks trustworthy without anyone checking what it predicts.

Where people slip

Ask what a measure has been validated to predict, and for whom. Repeatability answers neither question.

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