Sixteen owners of 2005 Chrysler Pacifica 2WD vehicles kept track of their average fuel economy for a month. The results are shown below. (a) Construct a 95 percent confidence interval for the mean. (b) What factor(s) limit the conclusions that can be drawn about the true mean? (Data are from www.fueleconomy.gov.)
20.8 | 20.0 | 19.4 | 19.7 | 21.1 | 22.6 | 18.3 | 20.1 |
20.5 | 19.5 | 17.4 | 22.4 | 18.9 | 20.2 | 19.6 | 19.0 |
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