The degrees of freedom for the t-test used to compare two population means (independent samples) with unknown variances (assumed equal) will be n₁ + n₂ - 2.

Question

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When comparing two independent samples with unknown but equal variances, the degrees of freedom for the t-test is calculated as the sum of the sample sizes minus 2, i.e., n₁ + n₂ - 2.

The Degrees of Freedom for the T-Test Used to Compare