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Calculate the upper value (limit) of the confidence interval of the mean if the sample size (n)

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Calculate the upper value (limit) of the confidence interval of the mean if the sample size (n) was 18, the sample standard deviation (s) was 5.5965, a confidence level of 95% (critical t=2.1098) was needed, and the sample mean (xbar) was 31.6617.;The correct answer is 34.4 but I would like to know how to get to the correct answer

 

Paper#31624 | Written in 18-Jul-2015

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