e "et Harmewark Hwp with Cher B. Aeonment 3.pdf x BB Assignment 3.pdf 1/2 Use the dara file Birthweight Smoking, which contains data for a random sample of babics born in Pennsyvania in 1989. Te data iclude the baby's hirth weight together with various characteristics of the mother, including whelher she smoked during the pregnancy, A detailed description is giver in Rirthweight SmokingDescription. In this exercise, you will investigate relationship between birth weight and smoking during pregnancy 1. Regress Birthweight a Smoker. What is the estimated effect of smoking on birth wright? 2. Regress Birthweight Smuker, Alcohol, and Nprevist. a. Explain why the exclusion of Aicahol and Npevist could lead to omitted variable bias in the regression estimated in Question 1 Refer ta the twa necessary conditnis of omitted variahle bias) b. Is the estimated cffect of smoking on birth weight substantially different from the regression that excludes Alcohol and Nprevisr? Does the regression in Ql seem to suffer from omitted variable bias? Is the coefficient on Ntrevist statistically significant at 10%,5% and 1% significance level)? Explain. e d. Test the joint null hypothesis that the coefficients on Smoker and Alcohol are equal to zero. 3. An altemative way to control for prenatal visits is to use the binary variables Tripre0 through Tripre3. Regress Birthweight on Smoker, Aicohol Tripreo, Tripru2, arnd Tripre3. Why is Triprel excluded from the regression? What would happen if you included it in the regression? a. b. Interpret the value of the estimated coefficients on Tripre2, and Tripre3. . Does the regression n 03 explain a larger fraction af the variance in hirth weight than the regression in 027 O lype hene to search 113 Titar Sock aund Watson's Inroduction so Economerics, 3 Updated Editicn Documentation for Birthweight Smoking The datafile Rirthweight Smoking is from the 989 linked National Natality-Mortality Detnil filks, which contains a census of infant biths and deaths. The data in bw smoking.data are for births in Pennsylvania in 1989 These data were provided by Porfessor Douglas Almond, Kenneth Chay, and David Lee and are a suhset of the data used in their paper "The Costs of Low Birth Weight," Qaerournal of Feomamies, August 2005, 20 1031-1083 The file contains 3,000 observations on the variables described bekw mu mokerindioequal to one if the mother smoked during prehewise ndicster-if mother dranklcohol O lype hene to search e "et Harmewark Hwp with Cher B. Aeonment 3.pdf x BB Assignment 3.pdf 1/2 Use the dara file Birthweight Smoking, which contains data for a random sample of babics born in Pennsyvania in 1989. Te data iclude the baby's hirth weight together with various characteristics of the mother, including whelher she smoked during the pregnancy, A detailed description is giver in Rirthweight SmokingDescription. In this exercise, you will investigate relationship between birth weight and smoking during pregnancy 1. Regress Birthweight a Smoker. What is the estimated effect of smoking on birth wright? 2. Regress Birthweight Smuker, Alcohol, and Nprevist. a. Explain why the exclusion of Aicahol and Npevist could lead to omitted variable bias in the regression estimated in Question 1 Refer ta the twa necessary conditnis of omitted variahle bias) b. Is the estimated cffect of smoking on birth weight substantially different from the regression that excludes Alcohol and Nprevisr? Does the regression in Ql seem to suffer from omitted variable bias? Is the coefficient on Ntrevist statistically significant at 10%,5% and 1% significance level)? Explain. e d. Test the joint null hypothesis that the coefficients on Smoker and Alcohol are equal to zero. 3. An altemative way to control for prenatal visits is to use the binary variables Tripre0 through Tripre3. Regress Birthweight on Smoker, Aicohol Tripreo, Tripru2, arnd Tripre3. Why is Triprel excluded from the regression? What would happen if you included it in the regression? a. b. Interpret the value of the estimated coefficients on Tripre2, and Tripre3. . Does the regression n 03 explain a larger fraction af the variance in hirth weight than the regression in 027 O lype hene to search 113 Titar Sock aund Watson's Inroduction so Economerics, 3 Updated Editicn Documentation for Birthweight Smoking The datafile Rirthweight Smoking is from the 989 linked National Natality-Mortality Detnil filks, which contains a census of infant biths and deaths. The data in bw smoking.data are for births in Pennsylvania in 1989 These data were provided by Porfessor Douglas Almond, Kenneth Chay, and David Lee and are a suhset of the data used in their paper "The Costs of Low Birth Weight," Qaerournal of Feomamies, August 2005, 20 1031-1083 The file contains 3,000 observations on the variables described bekw mu mokerindioequal to one if the mother smoked during prehewise ndicster-if mother dranklcohol O lype hene to search