This article is an excerpt from Excel 2007 Charts by John Walkenbach. A.k.a. Mr. Spreadsheet, John is arguably the foremost authority on Excel. His forty-plus books include Excel 2007 Power Programming with VBA, Excel 2007 Formulas, and the bestselling Excel 2007 Bible, all published by Wiley. He has also written hundreds of articles and created the award-winning Power Utility Pack. Visit Wiley.com to learn more about this book.
A box plot (sometimes known as a quartile plot or a box and whisker plot) is often used to summarize data. This type of chart is useful for making quick comparisons among groups of data.