$$ S_b\;=\;\int E(z)z^2dz $$ latex \hat{f}\left(\bar{x}\right)=\theta_{o}+\theta_f{1}{\bar{x}}_\mathbf{1}+\theta_\mathbf{2}{\bar{x}}_\mathbf{2}+{\ldots}+\theta_{k}(1) //väri

$$ S_b\;=\;\int E(z)z^2dz $$ latex \hat{f}\left(\bar{x}\right)=\theta_{o}+\theta_f{1}{\bar{x}}_\mathbf{1}+\theta_\mathbf{2}{\bar{x}}_\mathbf{2}+{\ldots}+\theta_{k}(1) //väri

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