The equal-variances test statistic of $\mu _ { 1 } - \mu _ { 2 }$ is Student t-distributed with n₁ + n₂ - 2 degrees of freedom, provided that the two sample sizes are equal.

Question

Quizplus · Accepted Answer

The correct formula for degrees of freedom when performing a two-sample t-test with equal variances is n1 + n2 - 2, regardless of whether the sample sizes are equal or not.

The Equal-Variances Test Statistic Of μ1−μ2\mu _ { 1 } - \mu _ { 2 }μ1​−μ2​

The Equal-Variances Test Statistic Of $\mu _ { 1 } - \mu _ { 2 }$