Textbooks on the Internet offer many advantages over their written counterparts. One advantage is the capability of having links to glossary items embedded in the text. Over 20 years ago Lachman (1989) showed that the availability of glossary items enhances the comprehension of online texts. Links to glossary items are incorporated in several online statistics books (e.g., Online Statistics Education: A Multimedia Course of Study, SurfStat, SticiGui, and Learner.org). Similarly, many online statistics books incorporate hyperlinks to related materials (e.g.,...