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

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

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