Which of the following is not a required assumption for constructing a confidence interval estimate of the difference between two population means when the samples are small?
A) The populations are normally distributed.
B) The population variances are equal.
C) The population variances are equal to 1.
D) The samples are selected at random from the populations.
E) The population variances are equal and the population variances are equal to 1.

Question

Quizplus · Accepted Answer

The assumption that the population variances are equal to 1 is not required for constructing a confidence interval estimate of the difference between two population means when the samples are small. The required assumptions are A) the populations are normally distributed, B) the population variances are equal, and D) the samples are selected at random from the populations. Option E includes B and C, both of which are not required assumptions.

Which of the Following Is Not a Required Assumption for Constructing