When estimating a confidence interval for the difference between 2 means using the method where sample variances are pooled,which of the following assumptions is not needed?
A)The populations are normally distributed.
B)The populations have equal variance.
C)The samples are independent.
D)The sample sizes are equal.

Question

Quizplus · Accepted Answer

When using the method where sample variances are pooled to estimate a confidence interval for the difference between 2 means, the assumption of equal sample sizes (D) is not needed. However, the assumptions of normality (A), equal variance (B), and independence (C) are still necessary.

When Estimating a Confidence Interval for the Difference Between 2