The population is the set of all units which are being studied. They need not be people: for example if I am trying to find the most popular colour for cars, the population would be all cars. If I was looking at the density of earthworms in my garden, my population could be each 20 cm x 20 cm in my garden.
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It is the population which you are studying.
The latest statistics of the rhino population
A representative sample is one where the statistics of the sample are the same as the statistics for the parent population.
Information obtained from the sample can be extrapolated to the whole population using statistics.
population -group statistically sampled.