Consider the following data: $\stackrel{}{x}=20,s_x=2\frac{,}{b}ar(y)=-5,s_y=4,$ and $b_1=-0\mathrm{.}8.$ Which of the following is the sample regression equation?

$00$:$31$:$55$

Multiple Choice

widehat$(y)=11+0\mathrm{.}80x$

hat$(y)=11-0\mathrm{.}80x$

hat$(y)=-21+0\mathrm{.}80x$

hat$(y)=-21-0\mathrm{.}80x$