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.

Question

Quizplus · Accepted Answer

A) In real-world problems, population variances are often unknown.
B) The two-sample t test is used when the population distributions are normal and population variances are unknown, and when sample sizes are small.
C) The pooled t-test procedure is only valid if population distributions are both normal with equal variances. 
Thus, all of the statements are true.

Which of the Following Statements Are True