Two-tailed hypotheses are typically made only when a researcher has a logical reason to believe that one particular direction of the effect will occur.

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Two-tailed hypotheses can be made even when there is not a logical reason to believe that one particular direction of the effect will occur. This is done to be more conservative and to allow for the possibility of both positive and negative effects.

Two-Tailed Hypotheses Are Typically Made Only When a Researcher Has