Clara examines the number of traumatic head injuries that occurred in California for five years before and after the passage of a law that made it mandatory for riders to wear a helmet. Clara's research design would be classified as a(n):
A)nonequivalent control group pretest-posttest design.
B)nonequivalent control group design.
C)control series design.
D)interrupted time series design.

Question

Quizplus · Accepted Answer

Clara's research design can be classified as an interrupted time series design since she is comparing the incidence of head injuries before and after the law was passed. This design allows for the examination of the effect of the intervention (helmet law) by looking at trends over time.

Clara Examines the Number of Traumatic Head Injuries That Occurred