Find a 98% confidence interval for the difference in mean fuel mileage between hot and cold engines.

A sample of 10 diesel trucks were run both hot and cold to estimate the difference in fuel economy. The results, in mpg, are presented in the following table.




The differences are: 0.30,0.38,0.66,0.41,0.38,0.58,0.20,0.16,0.41,0.50.



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