Question 1

The nc data frame contains observations on 13 different variables, some categorical and some numerical. The meaning of each variable is as follows:

fage: father's age in years.
mage: mother's age in years.
mature: maturity status of mother.
weeks: length of pregnancy in weeks.
premie: whether the birth was classified 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 classified 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.

There are 1,000 cases in this data set, what do the cases represent?