false negative error

Syn.: Type II error In hypothesis testing, an error that occurs when it is incorrectly concluded that a null hypothesis is true. Note: For example, a Type II error is made if no difference is detected between the outcomes in an experimental group and those in a control group when in fact such a difference exists. The probability of making this type of error is designated as beta (β).

ложно-отрицательная ошибка

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