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