Ononot — A scatter plot of n=10 data points yields an OLS regression

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Data Visualizationhard

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A scatter plot of $n=10$ data points yields an OLS regression line $\hat{y} = 0.5x + 3$ . If the sum of squares of the residuals $SSE = \sum (y_i - \hat{y}_i)^2 = 20$ and the total sum of squares $SST = \sum (y_i - \bar{y})^2 = 80$ , what is the correlation coefficient $r$ ?