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t-Test Effect Size (Cohen's d) Calculator

Compute the two-tailed Cohen's d effect size for a t-test, given the mean and standard deviation for two independent samples of equal size. Knowing the effect size is often very useful when comparing or reporting the results of analytics studies that rely on t-tests.

Please provide the necessary values, and then click 'Calculate'.

Mean for group 1:
Mean for group 2:
Standard deviation for group 1:
Standard deviation for group 2:
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