When reporting the test results for an independent-samples t test, N is reported rather than degrees of freedom.

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In reporting the results of an independent-samples t-test, degrees of freedom (df) are reported rather than N (the total sample size). The degrees of freedom for an independent-samples t-test are calculated based on the sample sizes of the two groups being compared, typically using the formula df = N1 + N2 - 2, where N1 and N2 are the sample sizes of the two groups.

When Reporting the Test Results for an Independent-Samples T Test