Which of the following statements are true? A. All of these statements are true.
ID: 3126250 • Letter: W
Question
Which of the following statements are true?
A. All of these statements are true.
B. The unequal-variances t-test is used whenever the population standard deviations are unknown and cannot be assumed to be equal.
C. None of these statements is true.
D. The z-test can be used as a close approximation to the unequal-variances t-test when the population standard deviations are not assumed to be equal, but samples are large (each n 30).
E. The pooled-variances t-test is used whenever the population standard deviations are assumed to be equal regardless of the sample size.
Explanation / Answer
B. The unequal-variances t-test is used whenever the population standard deviations are unknown and cannot be assumed to be equal. TRUE.
The homogeneity of variance assumption can not be satisfied.
E. The pooled-variances t-test is used whenever the population standard deviations are assumed to be equal regardless of the sample size.
Here the homogeneity of assumption is satisfied.