type I error

noun

: rejection of the null hypothesis in statistical testing when it is true

Examples of type I error in a Sentence

Recent Examples on the Web
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Perhaps there were unreported experiments that did not agree with the theoretical claims; perhaps the experiments were run in a way that improperly inflated the success and type I error rates, which would render the statistical inferences invalid. — Neuroskeptic, Discover Magazine, 17 Oct. 2014

Word History

First Known Use

1947, in the meaning defined above

Time Traveler
The first known use of type I error was in 1947

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Cite this Entry

“Type I error.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/type%20I%20error. Accessed 28 Sep. 2026.

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