A measure of central tendency provides information about the ‘middleness’ of a distribution of scores, but not about the width or spread of the distribution. • To assess the width of a distribution, we need a measure of variation or dispersion.
A measure of central tendency providesinformation about the ‘middleness’ of adistribution of scores, but not about thewidth or spread of the distribution.• To assess the width of a distribution,we need a measure of variation ordispersion.