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    1: \label{Statistics_Key}
    2: 
    3: The \textbf{Overall Problem Statistics} page displays the following 
    4: data about the problems currently in the course:
    5: 
    6: \begin{itemize}
    7: 
    8: \item \textbf{\#Stdnts}
    9: 
   10: Total number of students attempting the problem.
   11: 
   12: \item \textbf{Tries}
   13: 
   14: Total number of attempts to solve the problem.
   15: 
   16: \item \textbf{Max Tries}
   17: 
   18: Largest number of to solve the problem by a student.
   19: 
   20: \item \textbf{Mean Tries}
   21: 
   22: Average number of tries.
   23: 
   24: \item \textbf{S.D. tries}
   25: 
   26: Standard Deviation of the tries.
   27: 
   28: \item \textbf{Skew Tries}
   29: 
   30: Skewness of the students tries.
   31: \[\frac{\sqrt{ \sum{(Xi - Mean)^3} / \#Stdnts}}{\sigma^3}\]
   32: 
   33: \item \textbf{\#YES}
   34: 
   35: Number of students who solved the problem correctly.
   36: 
   37: \item \textbf{\#yes}
   38: 
   39: Number of students who solved the problem by override.
   40: 
   41: \item \textbf{\%Wrng}
   42: 
   43: Percentage of students who tried to solve the problem but were unable to.
   44: 
   45: \item \textbf{DoDiff}
   46: 
   47: Degree of Difficulty of the problem.  
   48: \[ 1 - \frac{\#YES+\#yes}{Tries} \]
   49: 
   50: \item \textbf{DoDisc}
   51: 
   52: Degree of Discrimination of the problem.
   53: 
   54: The students are grouped based on their scores on the sequence which 
   55: contains the homework problem.  The percent score of the bottom 25\% of
   56: the students is subtracted from the percent score the to top 25\% of
   57: the students.  This yields a number from -1 to 1. 1.0 indicates
   58: all of the good students answered the problem correctly and none of the
   59: poor students answered it correctly.  Conversely, a score of -1.0 indicates
   60: all of the good students got the problem wrong and the bad students did
   61: well.
   62: 
   63: \end{itemize}