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December 18, 2014

December 18, 2014

Posted by **Tanya** on Friday, November 2, 2012 at 3:38pm.

- MATH,statistics -
**MathGuru**, Saturday, November 3, 2012 at 7:26pmCohen's d is the difference between two means divided by a standard deviation.

Calculate Cohen's d (d) and the effect-size correlation (r) using the following formulas:

d = (M1 - M2) / s

r = d / √(d^2 + 4)

With your data:

d = (7.2 - 5) / 2 = 1.1

r = 1.1 / √(1.1^2 + 4) = 0.48

Check these formulas and calculations.

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