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 retum on equity. $\_1=+$X$\_1$ i $($Round to four decimal places as needed.$)$