Report how large a difference is, not only whether it is significant, as APA 7 requires.
Cohen's d Effect Size Calculator
Free Cohen's d effect size calculator from means, SDs and sample sizes. Get d, Hedges' g, Glass's delta, 95% CI and an APA-ready sentence.
Which one do I need?
- Cohen’s d Effect Size Calculator: Cohen’s d expresses the difference between two group means in standard-deviation units, so readers can judge how large an effect is, not just whether it is significant.