Effect size is a measure of how different two groups are from one another.

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Effect size is a quantitative measure of the magnitude of the difference between two groups. It represents the degree of association between two variables or the strength of the treatment effect in experimental or quasi-experimental designs. Effect size is typically reported as a standardized value, such as Cohen's d, which reflects the number of standard deviations by which the means of the groups differ. A larger effect size indicates a greater degree of differentiation, while a smaller effect size suggests a weaker or more ambiguous difference.

Effect Size Is a Measure of How Different Two Groups