\label{Statistics_Key}

The \textbf{Overall Problem Statistics} page displays the following 
data about the problems currently in the course:

\begin{itemize}

\item \textbf{#Stdnts}

Total number of students attempting the problem.

\item \textbf{Tries}

Total number of attempts to solve the problem.

\item \textbf{Max Tries}

Largest number of to solve the problem by a student.

\item \textbf{Mean Tries}

Average number of tries.

\item \textbf{S.D. tries}

Standard Deviation of the tries.

\item \textbf{Skew Tries}

Skewness of the students tries.
\[\frac{\sqrt{ \sum{(Xi - Mean)^3} / #Stdnts}}{\sigma^3}\]

\item \textbf{#YES}

Number of students who solved the problem correctly.

\item \textbf{#yes}

Number of students who solved the problem by override.

\item \textbf{\%Wrng}

Percentage of students who tried to solve the problem but were unable to.

\item \textbf{DoDiff}

Degree of Difficulty of the problem.  
\[ 1 - \frac{\#YES+\#yes}{Tries} \]

\item \textbf{DoDisc}

Degree of Discrimination of the problem.

The students are grouped based on their scores on the sequence which 
contains the homework problem.  The percent score of the bottom 25\% of
the students is subtracted from the percent score the to top 25\% of
the students.  This yields a number from -1 to 1. 1.0 indicates
all of the good students answered the problem correctly and none of the
poor students answered it correctly.  Conversely, a score of -1.0 indicates
all of the good students got the problem wrong and the bad students did
well.

\end{itemize}