Posted by Christine on Saturday, May 24, 2008 at 12:54pm.
Depending on the level of significance used, usually P=.01 or P=.05 (to reject the Ho, null hypothesis) the values needed for a one-tailed test (directional) are lower than those for a two-tailed (nondirectional) test.
This should start you out. I hope it helps. Thanks for asking.
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