Below there is a regression predicting birthweight as a function of cigarette consumption, family income, parity (birth order), the baby's sex and race, and the parents' education levels.

1. Which of the parameters (including the intercept) are statistically significant? How can you tell?

2. Our policy focus is on the impact of smoking during pregnancy. How would you interpret the baseline model's parameter for cigs?

3. What fraction of the variation in the baby's birthweight is explained by our baseline model? Where did you find that information?

Regression #1 regBaseline|t|) (Intercept) 109. 49226 3. 93245 27. 843