Epidemiology:
Several epidemiologic studies have reported positive significant associations between the consumption of heavy metal contaminated drinking water and certain cancers. Assuming you are leading a team of epidemiologists to assess the effect of water contamination at Flint, Michigan:
i. Describe how you would conduct an ecologic study to examine whether the consumption of drinking water by residents of Flint, Michigan was associated with cancer risks.
ii. Describe inherent methodological limitations of ecologic studies and how you plan to address these limitations in your study.