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Practical significance refers to the real-world importance, usefulness, or meaningfulness of a research finding. Even if a result is statistically significant, it may lack practical significance if the observed effect is trivial or too weak to have any meaningful impact in everyday life or practice.

Practical Significance

A result's statistical significance indicates that an effect is unlikely to be caused by random chance, whereas its practical significance measures its actual importance or usefulness in a real-world context. Because large sample sizes can make even very weak effects statistically significant, researchers must independently evaluate whether those findings hold any practical value.

Statistical Significance Versus Practical Significance

Clinical significance is the specific term used in clinical settings to describe practical significance. It evaluates whether the observed positive effect of a psychological treatment or intervention is substantial enough to justify its real-world implementation, taking into account factors such as time, effort, and cost when compared to existing alternatives.

Clinical Significance

An example of a finding that lacks practical significance is a study where a new treatment for social phobia produces a statistically significant positive effect, but the effect is too weak to justify the time, effort, and costs of implementing it over cheaper, existing treatments. Another example is finding statistically significant gender differences in mathematical problem-solving that are actually so small they are considered trivial in real-world contexts.

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