A Cohen's d of .30 and a correlation coefficient of .30 both signify the same degree of relationship strength.

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Cohen's d and correlation coefficient measure different things. Cohen's d measures the difference in means between two groups, while correlation coefficient measures the strength and direction of the linear relationship between two variables. A Cohen's d of .30 is considered a small effect size, whereas a correlation coefficient of .30 is considered a moderate effect size. Therefore, they do not signify the same degree of relationship strength.

A Cohen's D of