Do movies of different types have different rates of return on their budgets? here's a regression of usgross ($m) with an indicator variable comedy that is 1 for comedies and 0 for adventure films. complete parts (a) through (d). dependent variable is: usgross ($m) variable coefficient se(coeff) t-ratio upper p dash value r-squaredequals40.1% r-squared (adjusted)equals36.0% sequals57.35 49 degrees of freedom