Part of the title of this chapter is “experimental design.” Why is the design of an experiment so important? What is the main disadvantage of an experiment that is not properly designed?

Although four similar-sized small-car models exhibit similar miles per gallon (mpg) sticker ratings, there is some skepticism as to whether their mean mpg values are really equal. To test this equal-means hypothesis, several cars of each model are driven for 10,000 miles under nearly identical driving conditions. The observed mpg values are listed in the file P19_28.xlsx. Use one-way ANOVA to help decide whether the different models have equal mean mpg values, and write a short report to summarize your findings.

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