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Definition of Type I error
1. Noun. (statistics) Rejecting the null hypothesis when the null hypothesis is true. ¹
¹ Source: wiktionary.com
Medical Definition of Type I error
1. The statistical error (said to be of the first kind or alpha error) made in testing an hypothesis when it is concluded that a treatment or intervention is effective when it really is not. Sometimes referred to as a false positive. (12 Dec 1998)