Population: A collection of individual items
Sample: A selection of individual items from a population
Finite Population: A population where each item cane given a number
Infinite Population: A population where numbering each member is impossible
Sampling Unit: An individual member of a population
Sampling Frame: A list of sampling units used in practice to represent a population
Statistic: A quantity calculated solely from the observations in a sample
Sampling Distribution: A statistic that is defined by giving all possible values of the statistic and the probability of each occurring
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