created flag for stdev and variance to define whether sample or population
created flag for stdev and variance to define whether sample or population

jstat/jstat,smarden1/jstat,cmpolis/jstat,akrawitz/jstat,NorthDecoder/jstat,jstat/jstat,akrawitz/jstat,JeebsM/jstat,JeebsM/jstat,NorthDecoder/jstat,jamescgibson/jstat,smarden1/jstat,ggonzale/jstat,ggonzale/jstat