R-squared from the sums of squares

EasyStatistics~2m

An OLS regression reports an error (residual) sum of squares $\text{SSE} = 120$ and a regression (explained) sum of squares $\text{SSR} = 80$ . What is the $R^2$ of this regression?

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$\text{SST}=\text{SSR}+\text{SSE}$ . What fraction of it does the model explain?
$R^2=\text{SSR}/\text{SST}=80/200$ .

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0.4 (± 0.001)

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R-squared from the sums of squares

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