Technically, a representative sample requires only whatever percentage of the statistical population is necessary to replicate as closely as possible the quality or characteristic being studied or ...

It's not feasible to contact every member of the population, so only a sample, or a subset, of that population is included when conducting statistical research. The assumption is that the sample ...

The National Bureau of Statistics said on Thursday that it will launch a nationwide population sample survey to help accurately monitor demographic changes and assist in implementing social and ...