In the table below the miles per gallon of 2007 Ford Taurus car is shown for 13 different owners. Treat the sample as a simple random sample of all 2007 Ford Taurus cars. a. Construct a 95% confidence interval for the mean miles per gallon of a 2007 Ford Taurus. Interpret the interval. 28.5   26.0   21.7   26.3   18.8   24.0   23.4 23.8   23.5   26.1   28.4   18.0   25.2 b. How large a sample is required to estimate the mean miles per gallon with 0.5 mile per gallon with 95% confidence?

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