A Pearson correlation of r = −1.00 means that all the data points fit perfectly on a straight line.

Question

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A Pearson correlation of -1.00 indicates a perfect negative linear relationship between two variables, meaning that as one variable increases, the other variable decreases in a perfectly predictable manner. This does not necessarily mean that all the data points fit perfectly on a straight line, but rather that they fit perfectly on a straight line with a negative slope.

A Pearson Correlation of R = −1