A predictor that is significant in a one-tailed t-test will also be significant in a two-tailed test at the same level of significance α.

Question

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In a one-tailed t-test, the entire significance level α is allocated to one tail of the distribution, making it easier to achieve significance compared to a two-tailed test, where α is split between both tails of the distribution. Therefore, a predictor significant in a one-tailed test may not be significant in a two-tailed test at the same α level.

A Predictor That Is Significant in a One-Tailed T-Test Will