8.67 Sixteen owners of 2010 Audi A4 sedans 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?

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208 20.0 20.5 9 194 197 211 17.4 22.6 189 20.2 196 20.1 19.0 18.3 19.5 22.4