The file Sedans contains the overall miles per gallon (MPG)
of 2014 midsized sedans:
38 26 30 26 25 27 24 22 27 32 39
26 24 24 23 24 25 31 26 37 22 33
Source: Data extracted from Which Car Is Right for You,
Reports, April 2014, pp. 4041.
a. Construct a 95% confidence interval estimate for the
population mean MPG of 2014 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).
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