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A 90% confidence interval for mu, the population mean: A. Always contains x-bar, the sample mean...

A 90% confidence interval for mu, the population mean:

A. Always contains x-bar, the sample mean

B. Is created by a process that will yield an interval that does not contain mu 10% of the time

C. Is wider if s, the sample standard deviation, is used than if sigma, the population standard deviation, is known and used

D. All of the above

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