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*statistics*, dispersion (also called variability, scatter, or spread) is the extent to which a distribution is stretched or squeezed. Common examples of measures of*statistical*dispersion are the variance,*standard**deviation*, and interquartile range. Dispersion is contrasted with location or central tendency, and together they are the most used properties of distributions. A measure of*statistical*dispersion is a nonnegative real number that is zero if all the data are the same and increases as the data become more diverse. Most measures of dispersion have the same units as the quantity being measured.