DEFINITION of 'Sampling'
A process used in statistical analysis in which a predetermined number of observations will be taken from a larger population. The methodology used to sample from a larger population will depend on the type of analysis being performed, but will include simple random sampling, systematic sampling and observational sampling.
The sample should be a representation of the general population.
INVESTOPEDIA EXPLAINS 'Sampling'
When taking a sample from a larger population, it is important to consider how the sample will be drawn. To get a representative sample, the sample must be drawn randomly and encompass the entire population. For example, a lottery system could be used to determine the average age of students in a University by sampling 10% of the student body, taking an equal number of students from each faculty.

Control
1. The use of power to influence an outcome. For example, working ... 
Sample
A subset containing the characteristics of a larger population. ... 
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Sampling Error
A statistical error to which an analyst exposes a model simply ...

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