The T-Test Is INAPPROPRIATE for Investigating the Difference in Two

Multiple Choice

The t-test is INAPPROPRIATE for investigating the difference in two sample means when

A) the variance in the two populations can be assumed equal.
B) the characteristic of interest is normally distributed in each population.
C) a pooled estimator for the overall variance is warranted.
D) the data is ordinal or nominally scaled.
E) the samples are independent.