1. For the list of observational study types below, [briefly!] describe each one (like why you might use it over another, what it's good for, etc). a. Simple Cross-Sectional Simple cross-sectional studies collect data from all participants at the same time. This study would be useful for a health outcome study to determine how many people will be affected. I would be hesitant to implement this study because the amount of data collected from individuals could become overwhelming. b. Retrospective Case-Control In a retrospective case-control study, there are two groups: those who did not have an outcome and those who did. This study begins with the results and then investigates the factors that contributed to those results. I believe this study would be more organized because there are two groups, and the studies can be completed immediately. This can be useful for investigating different diseases and determining who did and did not contract the sickness. c. Simple Longitudinal Simple Longitudinal case control studies are d. Prospective Case-Control