Question: 18. Evaluate the observed mean difference. Does it seem to be sufficiently large to be meaningful? Absolutely, a .4 mean difference reduction always has practical

18. Evaluate the observed mean difference. Does it seem to be sufficiently large to be meaningful? Absolutely, a .4 mean difference reduction always has practical importance. Maybe. It is difficult to say, a .4 reduction on a seven-point scale may well be a meaningful decrease. It might be easier to interpret the standardized effect size (dz)

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