The file Sedans contains the overall miles per gallon (MPG) of 2015 midsized sedans: 26 38 26 30 24 26 28 28 24 26 24 39 32 23 22 24 28 37 31 40 25 25 33 30
a. Construct a 95% confidence interval estimate for the population mean MPG of 2015 midsized sedans, assuming a normal distribution.
b. Interpret the interval constructed in (a).
c. Compare the results in (a) to those in Problem 8.20(a).
The file SUV contains the overall MPG of 2015 small SUVs: 26 22 24 22 26 21 24 25 28 24 22 21 22 21 24 23 23 22 21 22
a. Construct a 95% confidence interval estimate for the population mean MPG of 2015 small SUVs, assuming a normal distribution.