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MathML

V a r ({\hat{β}}_{1}) \propto \frac{1}{N σ_{x}^{2}}

V a r ({\hat{β}}_{1}) \propto \frac{1}{N σ_{x}^{2}}

\[ \mr{Var} ( \hat{\beta }_{1} ) \, \propto \, \frac{1}{N \, \sigma ^{2}_{x}} \]