The data set consists of information on 4700 ​full-time full-year workers. The highest educational achievement for each worker was either a high school diploma or a​ bachelor's degree. The​ worker's ages ranged from 25 to 45 years. The data set also contained information on the region of the country where the person​ lived, marital​ status, and number of children. For the purposes of these​ exercises, let AHE ​= average hourly earnings​ (in 2005​ dollars) College ​= binary variable​ (1 if​ college, 0 if high​ school) Female ​= binary variable​ (1 if​ female, 0 if​ male) Age ​= age​ (in years) Ntheast ​= binary variable​ (1 if Region​ = Northeast, 0​ otherwise) Midwest ​= binary variable​ (1 if Region​ = Midwest, 0​ otherwise) South ​= binary variable​ (1 if Region​ = South, 0​ otherwise) West ​= binary variable​ (1 if Region​ = West, 0​ otherwise)