Measures of dispersion ariance VAR(x=o=e(x-e(x)) Standard deviation E(x-e(x) Sample variance ∑(x nth central moment E((x-E(x) nth moment about m E(x-m)")Measures of Dispersion • Variance • Standard deviation • Sample variance • nth central moment • nth moment about m (( ( )) ) 2 V E x  E x ( ) (( ( )) ) 2 2 VAR x V E x  E x ¦   n i i x x n S 1 2 2 ( ) 1 1 (( ( )) ) n E x  E x (( ) ) n E x  m