Search for an observational study Find an example of an observational study from a newspaper, journal, the Internet, or some other medium.

a. Identify the explanatory and response variables and the population of interest.

b. What type of observational study was conducted?

Describe how the data were gathered.

c. Were lurking variables considered? If so, discuss how.

If not, can you think of potential lurking variables?

Explain how they could affect the association.

d. Can you identify any potential sources of bias?

Explain.