A financial analyst engaged in business valuation obtained financial data on $71$ drug companies. Let $Y$ correspond to the price$-$to$-$book value ratio, $x_1$ correspond to the return

on equity, and $x_2$ correspond to the growth percentage. Use the accompanying data to complete parts a$.$ through $e.$ below.

Click the icon to view the business valuation data.

a$.$ Develop a regression model to predict price$-$to$-$book$-$value ratio based on return on equity.

hat$(Y{)}_i=,+0\mathrm{.}0699x_{1i}$

$($Round to four decimal places as needed.$)$

b$.$ Develop a regression model to predict price$-$to$-$book$-$value ratio based on growth.

widehat$(Y{)}_i=+x_{2i}$

$($Round to four decimal places as needed.$)$