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Population Means
The average value of a particular variable for the entire population, which provides a parameter that can be estimated through the use of sample means.
Pearson Correlation
A measure of the linear correlation between two variables X and Y, giving a value between +1 and -1 inclusive.
Covariance
A statistic that indicates the degree to which two variables vary together.
Nonlinear Relationship
A type of relationship between two variables where there is not a straight-line or proportional association.
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