If the value of the Pearson correlation between two variables is r = +1.00 or 1.00,then all data points in a scatter plot will fit perfectly on a straight line.

Question

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A correlation coefficient of +1.00 (or -1.00) indicates a perfect positive (or negative) linear relationship between two variables, meaning that all data points will fit perfectly on a straight line.

If the Value of the Pearson Correlation Between Two Variables