If $u = \frac{x-15}{10}$ and $v = \frac{y-50}{2}$ and $b_{yx} = 7.5$, What is the value of $b_{vu}$?
The regression line of YYY on XXX is y^=30−1.5x\hat{y} = 30 - 1.5xy^=30−1.5x. What is the value of y‾\overline{y}y if x‾=10\overline{x} = 10x=10?
