A correlation is a statistical relationship between two variables, such that knowing one of the variables makes it possible to predict the other.
A correlation can be defined as the relationship that exists between two variables when one of them is related to the other in some way.
It is also a measure that expresses the extent to which two variables are closely or linearly related which entails that they change together at a constant time.
Hence, correlation is a statistical relationship between two variables, such that knowing one of the variables makes it possible to predict the other.
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