(just how to solve those problems..) 3. You are asked to study
the relationship between maternal smoking and low birthweight. You
have a Stata dataset of babies’ birth weights and whether the
mother smoked during pregnancy. Let Yi be a binary variable that
equals 1 if a baby is born with low birthweight. Unless otherwise
indicated, assume that {Y1,Y2,...,Yn} are independent and
identically distributed. Use the dataset bwght2.dta for this
question. (a) Use Stata to compute the mean of Yi...