In a regression analysis using the usual model for Normal data, ten y values are observed, one at each of x=1,2,3,...10. Compute the estimated correlation between $\displaystyle \alpha$ and $\displaystyle \beta$.

(alpha and beta have hats on but I couldn't get the latex to work for that)

You can work out $\displaystyle S_{xx}$ from the given information. But I'm not sure where to begin to compute the correlation.