The Local Health Department of a Small Town Has Hired

Multiple Choice

The local health department of a small town has hired a research firm to study the development of cancer in residents in the town due to a suspected cancer-causing agent and environmental pollution.The researcher will compare data on the same participants at age 10,20,30,40,50,60,70,and so on,to see if there are increasing rates of cancer in the town.This type of research study is called a

A) longitudinal design.
B) cross-sectional design.
C) cohort research design.
D) correlational research design.