If a related-samples t test is significant,then it will also be associated with a large effect size.

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A significant related-samples t-test indicates that there is a statistically significant difference between the means of the two related groups, but it does not necessarily imply a large effect size. The effect size is a separate measure that indicates the magnitude of the difference, independent of sample size.

If a Related-Samples T Test Is Significant,then It Will Also