Problem
To study the link between physical activity and obesity, you and your research team identify two samples of people: those who are obese and those who are of a healthy weight. You then assess the proportion of people in both samples who have regularly engaged in physical activity over the course of their lifetime.
I. What type of study design is this, and if the study is carried out successfully, what sort of conclusions would you be able to make about the link between physical activity and obesity?
II. Describe an alternative design for the study of physical activity and obesity that might be better - making sure to specifically address the limitations of the design described above.