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A related measures study with an n of 20 produces a M D of 4 and a variance of 49.For this study, Cohen's d =

A related measures study with an n of 20 produces a M_Dof 4 and a variance of 49.For this study, Cohen's d = ____.

a.Cohen's d = 4/49

b.Cohen's d = 4/7

c.Cohen's d = 2/7

d.Cohen's d = 2/20

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