Answer
$n,\Sigma x,\ \Sigma y,\ \Sigma xy,\ \Sigma x^{2}$, and $\Sigma y^{2}$
Work Step by Step
In order to find
$r=\displaystyle \frac{n(\Sigma xy)-(\Sigma x)(\Sigma y)}{\sqrt{n(\Sigma x^{2})-(\Sigma x)^{2}}\sqrt{n(\Sigma y^{2})-(\Sigma y)^{2}}}$ ,
We need to calculate
$n,\Sigma x,\ \Sigma y,\ \Sigma xy,\ \Sigma x^{2}$, and $\Sigma y^{2}$
as these are the unknowns in the equation.
