One-tailed tests are used most often, unless compelling a priori knowledge exists or it is known that one group cannot have a larger mean than the other.

Name: One-tailed tests are used most often, unless compelling a priori knowledge exists or it is known that one group cannot have a larger mean than the other.
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Two-tailed tests are used most often unless there is a specific hypothesis that suggests a direction of difference or effect, in which case a one-tailed test might be appropriate.

One-Tailed Tests Are Used Most Often, Unless Compelling a Priori