Question
If the regression coefficients $b_{xy} = 1.6$ and $b_{yx} = 0.4$, and $\theta$ is the angle between the two lines of regression, then the value of $\tan \theta$ is
If the regression coefficients $b_{xy} = 1.6$ and $b_{yx} = 0.4$, and $\theta$ is the angle between the two lines of regression, then the value of $\tan \theta$ is