Which of the Following Statements Are True

Multiple Choice

Which of the following statements are true?

A) In real problems, it is virtually always the case that the values of the population variances are unknown.
B) The two-sample t test is applicable in situations in which population distributions are both normal when population variances have unknown values, and at least one of the two sample sizes are small.
C) The pooled t test procedure is applicable if the two population distribution curves are assumed normal with equal spreads.
D) All of the above statements are true.
E) None of the above statements are true.