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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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.
3039 * Significant at the 5 percent level for a two-tail test.