Measures Of Dispersion Flashcards
It indicate the degree or extent to which
numerical values are dispersed or spread out about the average value in distribution.
Measures of dispersion
It is found by finding the difference between the values of the third quartile
V(𝑄3) or upper quartile and the first quartile (𝑄1) or lower quartile.
Symbolically
Quartile range
It indicates the variation or dispersion of the values covering the middle
50% of the distribution of the data.
Semi quartile range
It takes into account the deviations of the individual values from the mean
Mean deviation
a more reliable measures of variation than the range
Mean deviation
It defined as the average of the squared deviations from the mean.
Variance
the most important measure of variation.
Standard deviation
A square root of the variance.
Standard deviation
