Correlation one of the most widely used statistical methods, indicates the extent to which two variables go together (e.g., height and weight). The most common type measures a linear relationship between two variables, and refers to how well they go together in a straight line. But not every pair of characters or variables can be assessed by using a statistical correlation, and different methods of correlation are used within the biological, medical, behavioural, social and environmental sciences, as well as in industry, commerce, economics and education. Different types of correlational
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