Question 3 A researcher is interested in the relationship between the birth weights of infants and mothers' smoking habits. He uses the birth weight of an infant (ounces) and the average n...
1. Consider the following estimated outcome: bwght = 119.77-0.514cigs Where bwght-infant birth weight in ounces; cigs-average number of cigarettes the mother smoked per day during pregnancy. (1) What is the predicted birth weight when cigs=0? What about when cigs-20(one pack per day)? Comment on the difference. (2) Does this simple regression necessarily capture a causal relationship between the child's birth weight and the mother's smoking habits? Explain. (3) To predict a birth weight of 125 ounces, what would cigs have...
A researcher is analysing the impact of smoking during pregnancy on infant health. Using a survey of 2000 infants, data on birth weights, smoking and family income produce the following OLS estimates: bwght =116.97 -0.46cigs; + 0.09faminc + lli (Model 1) (1.05) (0.09) (0.02) where bwght is weight at birth measured in ounces, cigs is the average number of cigarettes smoked per day during pregnancy and faminc is the annual income of the family measured in thousands of dollars, and...
3. (6 points) The dataset BWGT 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, the average number of cigarettes the mother smoked per day during pregnancy (cigs). The following simple OLS regression was estimated using data on n=1,388 births: bwgt = 119.77 – 0.514cigs a. What is the predicted birth weight when cigs=0? What about when cigs=20 (one pack per...
3. (6 points) The dataset BWGT 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, the average number of cigarettes the mother smoked per day during pregnancy (cigs). The following simple OLS regression was estimated using data on n=1,388 births: bwgt = 119.77 – 0.514cigs What is the predicted birth weight when cigs=0? What about when cigs=20 (one pack per day)?...
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...