When conducting two-sample tests for means with independent samples,________.
A)it is always assumed that the population variances are equal
B)the test for equality of variances is conducted,and if the variances are not equal the t-test in Excel should not be used
C)the test for equality of variances is conducted to determine if the variances are equal and thereby choose the appropriate t-test in Excel
D)it is always assumed that the population variances are unequal

Question

Quizplus · Accepted Answer

The test for equality of variances is conducted to determine if the variances are equal and thereby choose the appropriate t-test in Excel. This is because if the variances are equal, the pooled t-test can be used, whereas if the variances are unequal, the Welch t-test should be used instead. It is not always assumed that the population variances are equal or unequal, and simply avoiding the t-test in Excel if the variances are not equal is not the best option, as it may lead to incorrect conclusions.

When Conducting Two-Sample Tests for Means with Independent Samples,________