1 Some observations of bivariate data were made and the equations of the two regression lines were found to be as follows.
$$\begin{array} { c c }
y \text { on } x : & y = - 0.6 x + 13.0
x \text { on } y : & x = - 1.6 y + 21.0
\end{array}$$
- State, with a reason, whether the correlation between \(x\) and \(y\) is negative or positive.
- Neither variable is controlled. Calculate an estimate of the value of \(x\) when \(y = 7.0\).
- Find the values of \(\bar { x }\) and \(\bar { y }\).