**Effect Size, Cohen's d Calculator for T Test**
https://www.easycalculation.com/statistics/effect-size-t-test.php

Formula: r = sqrt ( ( t 2 ) / ( ( t 2 ) + ( df * 1) ) ) d = ( t*2 ) / ( sqrt (df) ) Where, r = Effect Size, d = Cohen's d Value (Standardized Mean Difference), t = T Test Value, df = Degrees of Freedom. The effect size r is generally classified into small, medium and large.

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