Gravetter, F. New York: West Publishing. Chapter 4: Variability So far we've discussed two of the three characteristics used to describe distributions, now we need to discuss the remaining - variability. Notice in our distributions that not every score is the same, e. So what we need to do is describe the varied results, rougly to describe the width of the distribution. Variability provides a quantitiative measure of the degree to which scores in a distribution are spread out or clustered together. In other words variablility refers to the degree of differentness of the scores in the distribution. High variability means that the scores differ by a lot, while low variability means that the scores are all similar homogeneousness.
The data axis is marked at this juncture with the lower class limits. Note that the last add up to is You could additionally mark the data axis using the upper class limits, before you could mark it along with the class midpoints. Whatever approach you use, the data affiliation will always have a attire numeric scale with tick marks at regular intervals and numbers next to the tick marks.
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