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Which of the following statements regarding the equal-standard-deviations assumption of the pooled t-test is the most accurate? The pooled t-test is robust to moderate violations

Which of the following statements regarding the equal-standard-deviations assumption of the pooled t-test is the most accurate?

The pooled t-test is robust to moderate violations of the assumption, if sample sizes are roughly equal.

The pooled t-test is robust to moderate violations of the assumption regardless of the sample sizes

The pooled t-test is extremely non-robust to violations of the assumption.

The pooled t-test is robust to moderate violations of the assumption, if the sample sizes are large.

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