The article "Heavy Drinking and Problems among Wine Drinkers" (Journal of Studies on Alcohol [1999]: 467-471) investigates whether wine drinkers tend to drink less excessively than those who drink beer and spirits. A sample of Canadians, strati?ed by province of residence and other socioeconomic factors, was selected.
a. Why might strati?cation by province be a good thing?
b. List two socioeconomic factors that would be appropriate to use for strati?cation. Explain how each factor would relate to the consumption of alcohol in general and of wine in particular.