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Standard deviation and variance are the most common measures of dispersion (variability) for data sets using the arithmetic mean as a measure of location, and for data sets where you use the median as the measure of location, a good measure is the interquartile range (75th percentile minus the 25th percentile).
The simple range (max - min) can be used in either case to measure dispersion, but it's not that great because it only uses the extremes.
...and I've never heard of the semiquartile.
