When testing a nondirectional hypothesis, we use a two-tailed test of significance.

Name: When testing a nondirectional hypothesis, we use a two-tailed test of significance.
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When testing a nondirectional hypothesis, we are interested in whether a relationship exists, regardless of the direction. Therefore, we use a two-tailed test of significance to assess both directions, rather than a one-tailed test which only assesses one direction.

When Testing a Nondirectional Hypothesis, We Use a Two-Tailed Test