The descriptive statistics report produced by OMS gives the statistical characteristics of the test scores for a class. Summary statistics provide a more comprehensible picture. The distribution statistics report is available for part scores as well as for the total score. The distribution of scores is the first level of score summarization. Statistics Statistics provide a second level of summarization of the score distribution.
Central tendency refers to the score that is most representative of the entire distribution.
Variability refers to the tendency of the scores to be either spread out or bunched up around the center. Central Tendency Three measures of central tendency are provided. The MEAN is the arithmetic average, the sum of all scores divided by the total number of scores. It is ordinarily the best measure of central tendency if the units on the score scale are equal, which is a reasonable assumption for most tests, and if the distribution of scores is symmetrical. The mean is heavily influenced by extreme scores.