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Concept

Measure of Spread

A measure of spread is a way of quantifying how spread out, or different, the points in a data set are. Some commonly used measures of spread are range, interquartile range, mean absolute deviation, and standard deviation. These are often used together with a measure of center, to give an idea both of what a typical value is and how much the data can be expected to deviate from it.

Interactive applet where points of the dot plot can be moved around.

Move the points around in the dot plot to generate new data. The applet tells the range, the interquartile range, the mean absolute deviation, and the standard deviation of the data set.