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Confidence interval for mean of automobiles

Thirty six automobiles of the same model are driven and the gas mileage for each is recorded. The results give a sample average of 24 miles a gallon and a sample standard deviation of 6 miles per gallon. Give a 90% confidence interval for the mean μ for all automobiles of this model

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The solution provides step by step method for the calculation of Confidence interval for mean . Formula for the calculation and Interpretations of the results are also included.