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Compare the confidence intervals when assuming the population standard deviation is known and is unknown.
The 85% confidence interval assuming the population standard deviation is known is
than the 85% confidence interval assuming the population standard deviation is unknown.
The 95% confidence interval assuming the population standard deviation is known is
than the 95% confidence interval assuming the population standard deviation is unknown.
The 99% confidence interval assuming the population standard deviation is known is
than the 99% confidence interval assuming the population standard deviation is unknown.

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