Chapter 8 Comparing Means (How a Qualitative Variable Relates to a Quantitative One)
It is much more common for a researcher to be interested in the difference between means—the focus of this chapter—than in the specific values of the means themselves. Note that we already learned in the chapter on graphing how to visually depict a comparison of means/medians using boxplots (Section 1.4.2). The formal analyses described in this chapter pair well with that sort of graph, since the formal tests allow one to make statements that explicitly account for the uncertainty and imprecision inherent in statistical inference.
