The null and the alternative hypotheses must be mutually exclusive and collectively exhaustive.

Name: The null and the alternative hypotheses must be mutually exclusive and collectively exhaustive.
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The null hypothesis (often denoted as H0) and the alternative hypothesis (denoted as H1 or Ha) are designed to be mutually exclusive, meaning they cannot both be true at the same time, and collectively exhaustive, covering all possible outcomes so that between them, they account for all possibilities.

The Null and the Alternative Hypotheses Must Be Mutually Exclusive