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