(* PS2.2, using DATA2-2 -- on means, s.d., c.v., Section 2.2 *)
summary colgpa 
(* learn about the summary command *)
help summary 
(* verify summary statistics by computing them separately *)
genr xbar=mean(colgpa)
(* s.d. of colgpa *)			
genr sdx=sd(colgpa)
(* variance of colgpa *)		
genr varx = sdx*sdx
(* coefficient of variation *)		
genr cv = sdx/xbar
(* list the variables *)                
list
(* reset sample range *)		
smpl 1 1 
(* print variables *)			
print xbar varx sdx cv 
