The probabilities of Type I and Type II errors always add up to 1.0.

Name: The probabilities of Type I and Type II errors always add up to 1.0.
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The probabilities of Type I and Type II errors do not add up to 1.0 because they are independent events. Type I error (rejecting a true null hypothesis) and Type II error (failing to reject a false null hypothesis) probabilities are related to different aspects of hypothesis testing and do not complement each other to make a whole.

The Probabilities of Type I and Type II Errors Always