According to Minnesota statutes, and probably laws in other states as well, a job class is considered to be female dominated if 70% of the employees or more in the job class are female. These data...

According to Minnesota statutes, and probably laws in other states as well, a job class is considered to be female dominated if 70% of the employees or more in the job class are female. These data were collected to examine whether female-dominated positions are compensated at a lower level, adjusting for Score, than are other positions. Create a factor with two levels that divides the job classes into female dominated or not. Then, fit a model that allows for a separate B-spline for Score for each of the two groups. Since the coefficient estimates for the B-splines are un interpretable, summarize the results using an effects plot. If your program does not allow you to use B-splines, use quadratic polynomials.