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    1: \label{Statistics_Sequence}
    2: 
    3: The \textbf{Overall Problem Statistics} page lets you view performance 
    4: statistics on all problems.  This page displays the following 
    5: data about the \textbf{Folders/Sequences} selected for evaluation:
    6: 
    7: \begin{itemize}
    8: 
    9: \item \textbf{\#Items}
   10: 
   11: The number of assessment items (problem parts) in the sequence.
   12: 
   13: \item \textbf{Score} and \textbf{Count} Statistics
   14: 
   15: For the score, the product of the problem weight, the percent awarded,
   16: the count, and the number of problem parts correct, the following data are 
   17: computed:
   18: 
   19: \begin{itemize}
   20:     \item \textbf{MEAN}
   21: 
   22:     \item \textbf{Standard Deviation}
   23: 
   24:     \item \textbf{Maximum}
   25: 
   26:     The highest achieved score or count in the data set.
   27: 
   28:     \item \textbf{Minimum}
   29: 
   30:     The lowest achieved score or count in the data set.
   31: 
   32:     \item \textbf{N}
   33: 
   34:     The number of students evaluated.
   35: 
   36: \end{itemize}
   37: 
   38: \item \textbf{KR-21}
   39: 
   40: This statistic measures the internal reliability of the data set.
   41: \textbf{This statistic is relevant for exams only.}  Let $K$ be the
   42: number of items in your test, $M$ the mean score on the test, $s$ the
   43: standard deviation of the scores on your test, then the KR-21
   44: statistic, $rk$, is given by the formula
   45: 
   46: $$ rk=\frac{K}{K-1}\cdot \frac{1-(M*(K-M))}{Ks^2} $$
   47: 
   48: \end{itemize}
   49: 
   50: You have the option to have this statistical data output to an Excel file. \\
   51: 
   52: Clicking on the problem name will open a view of the problem in a separate window.