A measure of the dispersion of observations in a process distribution is called: range.
This is further explained below.
Generally, The range of a collection of data is the difference between the highest and smallest values in the set. This difference is calculated by subtracting the sample maximum and minimum from the sample size. It is written out using the same units that were used for the data.
In conclusion, The term "range" refers to a measure of the dispersion of observations included within a process distribution.
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