In measuring the effect size of the difference between two population means,the rule of thumb suggests that a standardized effect size of around 0.5 can be classified as medium.

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Quizplus · Accepted Answer

This is true. A standardized effect size of 0.5 is typically considered to be a medium effect size. Other commonly used classifications are small effect size (0.2) and large effect size (0.8).

In Measuring the Effect Size of the Difference Between Two