When you compute the effect size in a one-group pretest-posttest study using a score for measuring depression, an effect size of 1.0 would mean that ______.

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An effect size of 1.0 indicates that the average score change (e.g., reduction in depression scores) from pretest to posttest is equivalent to one standard deviation of those scores. This measure of effect size does not directly address statistical significance (A, C, D) but rather the magnitude of change or difference observed.

When You Compute the Effect Size in a One-Group Pretest-Posttest