A researcher reports that the effectiveness of a new marketing campaign significantly increased sales compared with the previous campaign strategy, t (49) = 2.562, p <.05. Use eta-squared to interpret the effect size for this result. 12% of the variability in marketing effectiveness can be accounted for by the new marketing strategy?1. 1.12% of the standard error can be accounted for by the effectiveness of the marketing strategy. 2. Marketing effectiveness shifted 0.12 standard deviations above the mean in the population. 3. Both A and B are correct.
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