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population
the while set of items that are of interest
sample
some subset of the population intended to represent the population
sampling unit
each individual thing in the population that can be sampled
census
we could collect data either from a sample or from the entire population
advantages of census
should give completely accurate result
advantages sample
cheaper
quicker
less data to process
disadvantage of census
time consuming
expensive
cannot be used when testing involves destruction
large volume of data to process
sample disadvantages
data may not be accurate
data may not be large enough to represent small sub groups
Note 
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