If $Y$ and $X$ have the relation $y = a + bx$, where $b > 0$ then what is the value of $r$?
If a regression line is y^=31.5+1.85x\hat{y} = 31.5 + 1.85xy^=31.5+1.85x, estimate YYY for X=10X = 10X=10.
