If $S _ { x ,y } = - 289.17 \text { and } S _ { xx} = 340.2 \text {, }$

Short Answer

If $S _ { x ,y } = - 289.17 \text { and } S _ { xx} = 340.2 \text {, }$ then the least squares estimate of the slope coefficient $\beta _ { 1 }$ of the true regression line $y = \beta _ { 0 } + \beta _ { 1 } x \text { is } \hat { \beta } _ { 1 }$ = __________.