Oppgi Var(β^1)\text{Var}(\hat{\beta}_1)Var(β^1) og standardfeilen SE(β^1)\text{SE}(\hat{\beta}_1)SE(β^1).
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Var(β^1)=σ2Sxx,SE(β^1)=S2Sxx.\displaystyle \text{Var}(\hat{\beta}_1)=\frac{\sigma^2}{S_{xx}},\qquad \text{SE}(\hat{\beta}_1)=\sqrt{\frac{S^2}{S_{xx}}}.Var(β^1)=Sxxσ2,SE(β^1)=SxxS2. Stor spredning i xxx (stor SxxS_{xx}Sxx) gir mer presist estimat.
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