The hypothesis statement H0: µ = 90 is an example of a one-tail hypothesis test.

Name: The hypothesis statement H0: µ = 90 is an example of a one-tail hypothesis test.
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The hypothesis H0: µ = 90 is an example of a null hypothesis for a two-tailed test because it specifies equality, and the alternative hypothesis could either be µ > 90 or µ < 90, indicating interest in deviations in both directions from the specified value.

The Hypothesis Statement H0: µ = 90 Is an Example