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1- Assuming this represents a random sample from the population, the sample mean is an unbiased estimator of the population mean.

2-Because they are robust, t procedures are justified in this case.

3- We would use z procedures here, since we are interested in the population mean.

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hkjugykhuj

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Roman Abramovach

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Q: Which of the following best describes the condition necessary to justify using a pooled estimator of the population variance?
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