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Suppose n = 100. Which confidence interval for ( is unknown) uses a t distribution with more degrees of freedom: a 95% confidence interval or

Supposen= 100. Which confidence interval for ( is unknown) uses atdistribution with more degrees of freedom: a 95% confidence interval or a 99% confidence interval?
1. both confidence intervals have the same degrees of freedom
2. the 95% confidence interval
3. the 99% confidence interval
4. can't tell

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