Which of the following is consistent with what r2 represents as a measure of effect size? the portion of variability in a sample attributable to a treatment effect relative to the total variability in the sample   the portion of variability in a sample attributable to a treatment effect after correcting for sample size   the statistical significance of a treatment effect   the statistical significance of a treatment effect correcting for the alpha level

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A: n1 = 10 , n2= 15 X1¯=12 , X2¯=15.5  s1 = 10 , s2= 10 α=0.05

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