A directional test is one designed to detect differences from a hypothesized population mean score in one direction only.

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A directional test is also known as a one-tailed test, and it is designed to detect differences in one specific direction, either above or below the hypothesized population mean score. In contrast, a non-directional test (also known as a two-tailed test) is designed to detect differences in any direction from the hypothesized population mean score.

A Directional Test Is One Designed to Detect Differences from a Hypothesized