Ononot — In a scatter plot of n=50 points, the ordinary least squares

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Data Visualizationhard

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In a scatter plot of $n=50$ points, the ordinary least squares (OLS) regression line is $\hat{y} = 0.8x + 5$ . The total sum of squares (SST) is $1000$ and the sum of squared residuals (SSE) is $200$ . What is the correlation coefficient $r$ ?