There are four doctors in the city. Their offices are located in four different parts of the city ( south street, downtown, outskirts alley, and west street). Kevin is trying to figure out which doctor has the most patients. He observed that the downtown and west street areas have larger population. He Concurred that the doctors in those areas have more patients. After comparing those two areas, he decided that the west street doctor had the most patients because the area had the most traffic. What changes to kevin technique would have giving him a better understanding of which doctor has most patients?