The Estimated Regression Equation for a Sample of 500 College $\hat{ Y }$

Short Answer

The estimated regression equation for a sample of 500 college professors is given by: $\hat{ Y }$
= 275 - 3x - 2D,where y is retirement age,x is pre-retirement annual income (in $1000s),and D is a dummy variable that takes the value of 0 for female professors and 1 for male professors.Assume that there is a relationship between y,x and D.How does the average age at retirement for male professors change for each additional thousand dollars of pre-retirement income?
The average age at retirement ____________________ by ____________________ years