Annotation of loncom/html/adm/help/tex/Statistics_Sequence.tex, revision 1.4
1.1 matthew 1: \label{Statistics_Sequence}
2:
1.3 felicia 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:
1.1 matthew 6:
7: \begin{itemize}
8:
1.2 albertel 9: \item \textbf{\#Items}
1.1 matthew 10:
11: The number of assessment items (problem parts) in the sequence.
12:
13: \item \textbf{Score} and \textbf{Count} Statistics
14:
1.4 ! webbsuza 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
1.1 matthew 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}
1.3 felicia 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.
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