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How psychological tests measure abilities and personality, and what makes their results reliable and valid.
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From Psychometrics: Classical test theory · True Score and Measurement Error
How does classical test theory assume measurement error relates to people's true scores?
- It is uncorrelated with true scores
- It grows larger for low true scores
- It grows larger for high true scores
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Answer: It is uncorrelated with true scores
A core assumption is that error is unrelated to the true score; if error tracked ability, it would no longer be purely random.
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