6. Under which of the following circumstances is it IMPOSSIBLE to construct a confidence interval for the population mean?* A. A normal population with a small sample size and an unknown population variance. B. A normal population with a small sample size and a known population variance. C. A non-normal population with a large sample size and an unknown population variance. D. A normal population with a large sample size and a known population variance. E. A non-normal population with a O small sample size and an unknown population variance

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