two-tail test

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two-·tail test

a statistical test based on the assumption that the data are distributed in both directions from some central value.
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01 level between firm disappearance in the sample and control groups for Years 0-3 individually, Years 1-4 collectively, and for the aggregate respective sample periods using the two-tail test.
A test is either a one-tail or two-tail test, depending on the values of the sample result (usually, the sample proportion or sample mean) for which we reject the null hypothesis.
The answer depends on whether a one-tail or a two-tail test is being conducted.