If we are testing for the difference between two population means and assume that the two populations have equal and unknown standard deviations,the degrees of freedom are computed as (n₁)(n₂)− 1.

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Quizplus · Accepted Answer

The formula provided is incorrect and not the standard way to calculate degrees of freedom when testing for the difference between two population means with equal and unknown standard deviations. The correct approach typically involves using the sample sizes of the two groups and a formula related to the pooled variance estimate, often simplified in the form of the Welch-Satterthwaite equation for unequal variances or directly calculated for equal variances.

If We Are Testing for the Difference Between Two Population