the population is divided into subpopulations (strata) and random samples are taken of each stratum
a person who represents others
an advocate who represents someone else's policy or purpose
a member of the United States House of Representatives
standing for something else
being or characteristic of government by representation in which citizens exercise power through elected officers and representatives
(statistics) the selection of a suitable sample for study
items selected at random from a population and used to test hypotheses about the population
measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form)
