STATISTC 712 Study Guide - Midterm Guide: Weighted Arithmetic Mean, Frequency Distribution, Central Tendency
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Typically report the average and the variability (preferably sd) together to describe a distribution. The tendency of the central values. Is the mean value of the group of scores. Sensitive to extreme scores that can skew or distort findings. Makes sure that if a score occurs more than once, it"s not given extra weight. 1. list all values for which the mean is being calculated (list them only once) 2. list the frequency (number of times) that value appears. The weighted mean weights the score by the frequency. Use when you have data that do not include extreme scores and are not categorical. Use when you have extreme scores or outliers. When two values occur the same number of times. When three values occur the same number of times. Trimodal distributions are unlikely when dealing with a large set of data points, but they are possible. A characteristic of a person that can vary over different persons.
