To complete the table for Manuel's and Gretchen's data sets based on the calculations, here are the correct entries:
\begin{tabular}{|l|c|c|}
\hline
& \begin{tabular}{c}
Manuel's \\
Data Set
\end{tabular}
& \begin{tabular}{c}
Gretchen's \\
Data Set
\end{tabular}
\\
\hline
Mean
& 11.4
& 9.6
\\
\hline
Median
& 12
& 12
\\
\hline
\begin{tabular}{l}
Standard \\
Deviation
\end{tabular}
& 5.85
& 37.48
\\
\hline
\begin{tabular}{l}
Interquartile \\
Range
\end{tabular}
& 9.0
& 9.0
\\
\hline
\end{tabular}
So, the completed table looks like this:
\begin{tabular}{|l|c|c|}
\hline
& \begin{tabular}{c}
Manuel's \\
Data Set
\end{tabular}
& \begin{tabular}{c}
Gretchen's \\
Data Set
\end{tabular}
\\
\hline
Mean
& 11.4
& 9.6
\\
\hline
Median
& 12
& 12
\\
\hline
\begin{tabular}{l}
Standard \\
Deviation
\end{tabular}
& 5.85
& 37.48
\\
\hline
\begin{tabular}{l}
Interquartile \\
Range
\end{tabular}
& 9.0
& 9.0
\\
\hline
\end{tabular}