In Testing the Difference Between Two Means from Two Normally

Multiple Choice

In testing the difference between two means from two normally distributed independent populations,the distribution of the difference in sample means will be:

A) Normally distributed only if sample sizes are equal.
B) Normally distributed only if both population standard deviations are known.
C) Normally distributed.
D) Normally distributed if both sample sizes are very large.
E) Normally distributed only if both population variances are equal.