(Solution) - The file Sedans contains the overall miles per gallon MPG -(2025 Original AI-Free Solution)

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The file Sedans contains the overall miles per gallon (MPG) of 2013 midsized sedans:
38 26 30 26 25 27 22 27 39 24 24 26 25
23 25 26 31 26 37 22 29 25 33 21 21
Source: Data extracted from "Ratings," Consumer Reports, April 2013, pp. 30-31.
a. Construct a 95% confidence interval estimate for the population means MPG of 2013 family 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).