Merge branch 'master' of github.com:OpenIntroStat/openintro-statistics

Author: mine-cetinkaya-rundel

ch_intro_to_data/TeX/ch_intro_to_data.tex

@@ -473,7 +473,7 @@ \subsection{Types of variables}
 categorical?\footnotemark
 \end{nexercise}
 \end{exercisewrap}
-\footnotetext{There
+\footnotetext{The
   \var{group} variable can take just one of two group names,
   making it categorical.
   The \var{num\us{}migraines} variable describes