When testing the difference between two population means, the degrees of freedom must be computed when
A) the population standard deviations are known and equal.
B) the population means are known.
C) the population standard deviations are assumed unequal and unknown.
D) the population standard deviations are assumed equal but unknown.

Question

Quizplus · Accepted Answer

When the population standard deviations are assumed unequal and unknown, the degrees of freedom must be computed using a specific formula, often involving the sample sizes and variances, such as the Welch-Satterthwaite equation.

When Testing the Difference Between Two Population Means, the Degrees