If we use a one-tailed test of significance, but get findings that would be significant in the opposite tail, we can reject the null hypothesis and conclude that the results have confirmed the opposite of what we predicted.

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In a one-tailed test, if findings are significant in the opposite tail, it does not support rejecting the null hypothesis in favor of the alternative hypothesis as initially predicted. The test is directional, and results in the opposite direction are not considered evidence against the null hypothesis in the context of the test's original prediction.

If We Use a One-Tailed Test of Significance, but Get