3. 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. а. b. 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 230). с. d. All of these statements are true. ----- -- e. None of these statements is true.

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