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Population
whole set of items that are of interest (raw data)
Census
observes or measures every member of a population
Sample
selection of observations taken from a subset of the population which is used to find out information about the population as a whole
Sampling units
individual units of a population
Sampling frame
sampling units of a population are individually named or numbered to form a list
Advantage of a census
accurate
Disadvantage of a census
expensive
some testing destroys the item e.g. life of a battery