When testing for differences between the means of 2 related populations, we can use either a one-tail or two-tail test.

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This statement is true. When testing for differences between the means of 2 related populations, we can use either a one-tail or two-tail test depending on the research question and hypothesis. In a one-tail test, the hypothesis is directional, meaning we are testing for a specific direction of difference between the means, whereas in a two-tail test, the hypothesis is nondirectional, meaning we are simply testing for a difference between the means regardless of direction.

When Testing for Differences Between the Means of 2 Related