**Cohen's d for Paired Samples | Real Statistics Using Excel**
https://www.real-statistics.com/students-t-distribution/paired-sample-t-test/cohens-d-paired-samples/

Since the two-sample paired data case is equivalent to the one-sample case, based on the differences between the sample elements, we can use the same approach for calculating the effect size, statistical power and sample size as we used in One Sample t Test.In particular, Cohen’s effect size is

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