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Erstellt / Aktualisiert 07.09.2015 / 02.05.2019
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Random Sampling

Subjects are selected using a chance method or a random number.

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Systematic Sampling 

Subjects are selected using a system of every  kth number after the beginning number is selected randomly.

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Stratified Sampling 

Subjects are selected by first dividing up the population into groups (called strata) and subjects within each group are selected randomly.

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Cluster Sampling 

Subjects are selected by using "intact" groups that are representative of the population.   Used

when the population is large  OR  population resides over a large geographic area.