one half of the interquartile range of a distribution.

a quantity expressing the amount of variation or dispersion of a set of values from the mean value for the group, calculated by taking the square…

standard deviation.

Mathematics. A range of values forming a subset of a larger range.

Statistics. The difference observed in a sample between the smallest and largest values of a variable.

Statistics. The mean of the squares of the deviations of a set of quantities; the square of the standard deviation.

A range of numerical values; the difference between the highest and lowest values in a range.

Statistics. A standard deviation: used in the singular as if the name of a unit.