Revisiting tvphyslife.dta looking at life expectancy and people per physician, create a new variable, equal to square term of people per physician. Now run a quadratic regression and include both people per physician and people per physician squared in the model (y = a + b1x + b2x2). What is the coefficient of the linear term in the Stata or R output (b1) (3 decimal points)? Choose the correct answer from below. O-0.002 O.0004 1.127 71.936