The birth weight (W) of infants is modeled as the outcome variable in a regression with gestational time (Gest) and mother's smoking status (Smoke) as predictor variables. W = -2390 + 143.10 Gest - 244.5 Smoke where W represents the birth weight in grams Gest is the gestational age in weeks of pregnancy Smoke is coded as 1 if the mother smoked during pregnancy and as 0 if the mother did not smoke during pregnancy. Which is the correct interpretation of the coefficient for the variable 'Smoke'?
1) Mothers who smoke during pregnancy have children whose birth weight is 2390 grams lower on average than mothers who do not smoke during pregnancy.
2) Given two children born at the same gestational age, mothers who smoke have newborns whose average weight is 244.5 grams lower than mothers who do not smoke.
3) Mothers who smoke have newborns whose average weight is 244.5 grams lower than mothers who do not smoke.