T-test

When designing an experiment, the research hypothesis may be directional or non-directional.  For this discussion, identify the differences between a directional and non-directional hypothesis.  In addition, discuss how the directionality is related to the one- and two-tailed t-test.  Is there an assumption that is violated if a two-tailed t-test is used with a directional hypothesis?  Explain your reasoning.

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