Please read the example and answer the questions briefly within 200 words and simple write-up.
Imagine that you want to study cell phone use by drivers. You decide to conduct an observational study of drivers by making observations at three locations- a busy intersection, an entrance/exit to a shopping mall parking lot, and a residential intersection. You are intersted in the number of people who use cell phones while driving.
How would you recommend collecting the data? What concerns do you need to take into consideration?