Question

4 The data set BWGHT contains data on births to women in the United States. Two variables of interest are the dependent variable, infant birth weight in ounces (bwght), and an explanatory variable, ava number of cigarettes the mother smoked per day during pregnancy (cigs). The following simple to sion was estimated using data on n = 1,388 births: bwght = 119.77 – 0.514 cigs (i) What is the predicted birth weight when cigs = 0? What about when cies = 20 (one pack per day)? Comment on the difference. Does this simple regression necessarily capture a causal relationship between the childs weight and the mother's smoking habits? Explain. nship between the child's birth

Answer 1

Solution (i) bright = 119.77-0514 Cigs when 119.77 BALA, Oonces I when cigs 20 man skal sa I brught a 1o9.ua orances but a (et) Yes the Negression Eajuation Captors in I Causal Relationship between Child birth weight and mother's smoking habits As the average Members of cig the mother 1 Smokes per day increases birth weight decreases with Enecorage of 0.514 per eig- (Pop). The average numbers of cigs have to be o (New) to etioun a birth weight of 125 ouncess C V (iv) 851. of Mother will give birth to Children with average weight greater than Enjual to 119.11. aunces to CamScanner