Which of the following statements are true? The pooled-variances t-test is used whenever the population standard deviations are assumed to be equal regardless of the sample size. The unequal-variances t-test is used whenever the population standard deviations are unknown and cannot be assumed to be equal. 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). All of these statements are true. None of these statements is true.

The statements are:The pooled-variances t-test is used whenever the population standard deviations…

Answered: Which of the following statements are…

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Which of the following statements are true?

The pooled-variances t-test is used whenever the population standard deviations are assumed to be equal regardless of the sample size.
The unequal-variances t-test is used whenever the population standard deviations are unknown and cannot be assumed to be equal.
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).
All of these statements are true.
None of these statements is true.