The file E53 contains the overall miles per gallon (MPG) of 2012 small SUVs:
20 22 23 22 23 22 22 21 19
22 22 26 23 24 19 21 22 16
Source: Data extracted from "Ratings," Consumer Reports, April 2012, pp. 3536.
a. Construct a 95% confidence interval estimate for the population mean MPG of 2012 small SUVs, assuming a normal distribution.
b. Interpret the interval constructed in (a).
c. Compare the results in (a) to those in Problem 8.19(a).