Pearson r is the slope of the least squares regression line when the scores are plotted as z scores.

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This statement is true. Pearson r, also known as the correlation coefficient, measures the strength and direction of the linear relationship between two variables. When the scores are transformed into z scores, which have a mean of 0 and a standard deviation of 1, the correlation coefficient calculated is referred to as the standardized or normalized correlation coefficient, and the slope of the least squares regression line will be equal to the correlation coefficient.

Pearson R Is the Slope of the Least Squares Regression