The r-value that represents the strongest correlation is -0.81 (option C). Details about correlation coefficient can be found below.
Correlation coefficient is any of the several measures indicating the strength and direction of a linear relationship between two random variables.
The correlation coefficient is denoted by r. A r-value can either be negative or positive depending on the direction of the relationship.
However, the closer a r-value is to 1, the stronger the relationship. This means that a r-value of -0.81 represents the strongest correlation.
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