The data in the following table refers to a survey of
students in their final year of high school from a nun-urban area near Dayton
Ohio USA. The survey asked the students whether they had ever used alcohol, 
cigarettes or marijuana. The given table also classifies the students by gender 
and race.

\begin{center}
\begin{tabular}{ccccrcrcrcrcrcrcrcr}
\multicolumn{3}{c}{Race} & & \multicolumn{7}{c}{White} & & \multicolumn{7}{c}{Other} \\[2pt] \cline{5-11} \cline{13-19} 
\\[-5pt]
\multicolumn{3}{c}{Gender} & & \multicolumn{3}{c}{Female} & & \multicolumn{3}{c}{Male}  
                              & & \multicolumn{3}{c}{Female} & & \multicolumn{3}{c}{Male} \\[2pt] \cline{5-7} \cline{9-11} 
                                                                                             \cline{13-15} \cline{17-19}
\\[-5pt]
 &    & &  \multicolumn{15}{c}{\phantom{xxxxxxx} Marijuana Use}  \\[2pt] \cline{5-19}
\\[-20pt]
 Alcohol   &    & Cigarette \\[-1pt]
Use &  & Use &\phantom{x}  & Yes & & No &\phantom{xx} & Yes & & No &\phantom{xx} & Yes & & No &\phantom{xx} & Yes & & No 
\\[2pt] \hline
\\[-5pt]
Yes &  &  Yes & & 405 & & 268 & & 453 & & 228 & & 23 & & 23 & & 30 & & 19 \\
    &  &  No  & &  13 & & 218 & &  28 & & 201 & &  2 & & 19 & &  1 & & 18 \\
No  &  &  Yes & &   1 & &  17 & &   1 & &  17 & & 0  & &  1 & &  1 & & 8 \\
    &  &  No  & &  1 & & 117 & &   1 & & 133 & & 0  & &  12 & & 0 & & 17 \\
\end{tabular}
\end{center}



