Measures of Variability
A measure of central tendency is the first important characteristic of a frequency distribution. It tells us much about a distribution but by no means does it give us a complete picture. When it is necessary to compare two distributions, if the comparison is made solely on the basis of the averages, quite wrong conclusions may be drawn. Other statistical measurements must be used with averages to amplify the description of a set of data. We shall now consider some further attributes of frequency distributions which can be expressed as numbers.
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