http://www.ck12.org Chapter 8. Organizing and Displaying Data for Comparison
CHAPTER
(^8) Organizing and Displaying
Data for Comparison
Chapter Outline
8.1 Basic Graph Types
8.2 DOUBLELINEGRAPHS
8.3 TWO-SIDEDSTEM-AND-LEAFPLOTS
8.4 DOUBLEBARGRAPHS
8.5 DOUBLEBOX-AND-WHISKERPLOTS
Introduction
Throughout this book, you have learned about variables. You have learned about random variables, discrete vari-
ables, continuous variables, numerical (or quantitative) variables, and categorical (or qualitative) variables. The
various forms of graphical representations you have learned about in the previous chapters can be added to your
learning of variables. The graphic below may help to summarize what you have learned.
Broken-line graphs, histograms, pie charts, stem-and-leaf plots, and box-and-whisker plots all represent useful (often
very useful) tools in determining trends. Broken-line graphs, for example, allow you to show situations such as the
distance traveled in specific time spans. Histograms use continuous grouped data to show the frequency trend in
the data. Bar charts are a little different from histograms in that they use grouped discrete data, as do stem-and-leaf
plots. Bar graphs, as you know, have gaps between the columns, while histograms do not. Stem-and-leaf plots are
excellent for giving you a quick visual representation of data. Used for only smaller sets of data, stem-and-leaf plots
are a good example of representations of grouped discrete data. Box-and-whisker plots are a final visual way of