According to the World Health Organization, obesity has reached epidemic proportions globally. While obesity has generally been linked with chronic disease and disability, researchers argue that it may also affect wages. In other words, the body mass index (BMI) of an employee is a predictor for salary. (A person is considered overweight if his/her BMI is at least 25 and obese if BMI exceeds 30.) Consider salary data (in 51,000s) of 30 college-educated men with their respective BMI and a race dummy that represents 1 for white and 0 otherwise. A portion of the data is shown in the accompanying table; the complete data set can be found on the text website, labeled BMI.