1. PERSON: Snow conducted many hypothesis-generating interviews, obtaining demographic
information (most clearly occupation and address) and information about travel and leisure
activities. He also studied the relationships between people to try
-title: "Problem 3"
author: "Abby Smith"
date: "Wednesday, November 04, 2015"
The response variable is death by a heart attack. The explanatory variable is
the medication taken.
The stratification variable is the study becaus