A researcher wants to find out whether the rate of asthma is higher among groups of people who have been exposed to air pollution. Which kind of study should she do?

Question

Quizplus · Accepted Answer

Population comparison (Ecological study) is a type of observational study that compares the rates of a disease in different groups of people who have been exposed to different levels of air pollution.

A Researcher Wants to Find Out Whether the Rate of Asthma