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StatisticsIntermediate

Type II Error

Definition

A false negative: failing to reject a false null hypothesis, concluding that no effect exists when one actually does. The probability of a Type II error is denoted by beta.

Example

A study with too few participants may fail to detect a real drug effect — this is a Type II error.

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Related Terms

Type I ErrorPower AnalysisSample SizeHypothesis

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Last updated: March 2026