Give a sentence that describes the meaning of the two estimated coefficients. An alternative mean function fit to these data with an additional term, Years, the number of years employed at this...

Give a sentence that describes the meaning of the two estimated coefficients.

An alternative mean function fit to these data with an additional term, Years, the number of years employed at this college, gives the estimated mean function

The important difference between these two mean functions is that the coefficient for Sex has changed signs. Using the results of this chapter, explain how this could happen. (Data consistent with these equations are presented in Problem 5.17).