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Correlation in statistics refers to a statistical technique used to measure and describe the strength and direction of a relationship between two variables. In psychology, correlation is frequently used to examine how different psychological variables are associated. For instance, researchers may study whether there is a relationship between stress levels and academic performance, or between sleep quality and mood. The most commonly used measure of correlation is the Pearson product-moment correlation coefficient, denoted as *r*. _________ __________ ________ ______ ________ _____ _________ _____ ___.
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