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In 2004, the state of North Carolina released a large data set containing information on births recorded in this state. A random sample of observations from this data set is availableat . We have observations on 13 dierent variables, some categorical and some numerical. The meaning of each variable is as follows:  fage: fathers age in years.  mage: mothers age in years.  mature: maturity status of mother.  weeks: length of pregnancy in weeks.  premie: whether the birth was classi ed as premature (premie) or full-term.  visits: number of hospital visits during pregnancy.  marital: whether mother is married or not married at birth.  gained: weight gained by mother during pregnancy in pounds.  weight: weight of the baby at birth in pounds.  lowbirthweight: whether baby was classi ed as low birthweight (low) or not (not low).  gender: gender of the baby, female or male.  habit: status of the mother as a nonsmoker or a smoker.  whitemom: whether mom is white or not white.


Pick a pair of numerical and categorical variables and come up with a research question evaluating the relationship between these variables. Formulate the question in a way that itcan be answered using a hypothesis test and/or a con dence interval.