DEFINITION of 'Population'
The entire pool from which a statistical sample is drawn. The information obtained from the sample allows statisticians to develop hypotheses about the larger population. Researchers gather information from a sample because of the difficulty of studying the entire population. In statistical equations, population is usually denoted with a capital 'N', while the sample is usually denoted with a lowercase 'n'.
INVESTOPEDIA EXPLAINS 'Population'
For example, let's say a denim apparel manufacturer wants to check the quality of the stitching on its blue jeans before shipping them off to retail stores. It is not cost effective to examine every single pair of blue jeans the manufacturer produces (the population). Instead, the manufacturer looks at just 50 pairs (a sample) to draw a conclusion about whether all 500 pairs of jeans produced (the population) are likely to have been stitched correctly.

Uniform Distribution
In statistics, a type of probability distribution in which all ... 
Symmetrical Distribution
A situation in which the values of variables occur at regular ... 
Negative Correlation
A relationship between two variables in which one variable increases ... 
Positive Correlation
A relationship between two variables in which both variables ... 
Simple Random Sample
A subset of a statistical population in which each member of ... 
Probability Distribution
A statistical function that describes all the possible values ...

What are some examples of stratified random sampling?
Simple random sampling is a sample of individuals that exist in a population; the individuals are randomly selected from ... Read Full Answer >>

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