The word "correlation" is often used incorrectly as a synonym for:

Question

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"Correlation" refers specifically to the degree to which two (or more) variables are related or associated with one another. It does not refer to the variables themselves, the reliability of the measurements used to assess the variables, or the validity of the study's conclusions. While a correlation certainly implies a relationship between variables, it is more precise to use the term "correlation" when discussing the degree or strength of that relationship.

The Word "Correlation" Is Often Used Incorrectly as a Synonym