ABSTRACT
The simplest measure of dispersion of a series of variables is the quartile deviation (Q), sometimes called the semiinterquartile range. It is found thus: https://www.w3.org/1998/Math/MathML"> Q = Q 3 − Q 1 2 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315009810/61a4cc26-c726-4977-a558-75fbf99de4a5/content/eqn1_40_B.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
