If a repeated-measures study shows a significant difference between two treatments with α = .01, then you can be sure that _____. A)the value of Cohen's d is large. B)the percentage of variance explained (r²) is large C)both Cohen's d and r² are large D)A significant effect does not necessarily mean that the effect size will be large.

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A significant effect does not necessarily mean that the effect size will be large. Statistical significance indicates that the observed effect is unlikely to be due to chance, but it does not provide information about the magnitude of the effect.

If a Repeated-Measures Study Shows a Significant Difference Between Two