4. STATA exercise: Download the STATA dataset \"SmokingCigarettes.dta" from Courseworks and open it in STATA. (a) {6 points) Run a regression to estimate how the average number of cigarettes smoked weekly depends on somebody's age, sex, whether the person is Black, Hispanic or neither, whether there is a smoking ban at the workplace, and the level of education. Show the STATA command and its output. lnterpret the coefficient on age . (b) (6 points) Using a lincom command test whether everything else constant, aging by 10 years is associated with smoking fewer than 1.? additional cigarettes. Show the STATA command and its output. What would be the conclusion of the test at 5% signicance level? (c) {6 points) Use a lincom command to predict the average number of cigarettes smoked by a 30 year old Black, non-Hispanic female who graduated from college and who doesn't face a smoking ban at the workplace. Show the STATA command and its output. What is the predicted value? (d) (6 points) Using a lincom command test that a 30 year old Black, non-Hispanic female who graduated from college and who doesn't face a smoking ban at the workplace smokes more than 6 cigarettes weekly. Show the STATA command and its output. What would be the conclusion of the test at 10% signicance level