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Choose a one-tailed test if you have a specific directional hypothesis; use a two-tailed test if you are testing for any significant difference without direction.
To determine whether to use a one-tailed or two-tailed test, consider the nature of your hypothesis. If your hypothesis specifies a direction, a one-tailed test is appropriate; if your hypothesis simply indicates a difference without specifying a direction, a two-tailed test should be used.
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use a one-tailed test for directional hypotheses and a two-tailed test for non-directional hypotheses.
It depends to the given to determine the tailed