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If an experimental group's mean of 60 is a better outcome than the control group's mean of 55, and the standard deviation is 10, then the d-index equals:

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If an experimental group's mean of 60 is a better outcome than the control group's mean of 55, and the standard deviation is 10, then the d-index equals: a..50 b.5.0 c.2.0 d..05 c

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