Pearson’s correlation coefficient is the test statistics that measures the statistical relationship, or association, between two continuous variables. It is known as the best method of measuring the association between variables of interest because it is based on the method of covariance. It gives information about the magnitude of the association, or correlation, as well as the direction of the relationship.
Do test scores and hours spent studying have a statistically significant relationship?
Is there a statistical association between IQ scores and depression?
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Degree of correlation: