6 (6 points) In the United States, age discrimination is illegal, but its occurrence is hard to prove (Newsweek, March 17, 2010). Even without discrimination, it is widely believed that wages of workers decline as they get older. A young worker can expect wages to rise with age only up to a certain point, beyond which wages begin to fall. Joan works in the human resources department of a large manufacturing firm and is examining the relationship between wages (in $), education (in years of school), and age. Specifically, she wants to verify the quadratic effect of age on wages. She gathers data on 80 workers in her firm with information on their hourly wage, education, and age. The data is provided on the Minitab file Homework 4 - Question 6. Homework 4 (72 points) Page 4 of 9 a. (1 point) Plot Wage against Age and evaluate whether a linear or quadratic regression model better captures the relationship. b. (2 points) Write the linear and quadratic regression models. Run the regressions and using Adjusted R2 state, verify which model is better. Please note that here you have two independent variables. One of them is (Age) which will have