A researcher records the number of motorcycle fatalities before and after the implementation of a mandatory helmet law. During the same period, she compares this number to the number of motorcycle fatalities of three states that do not have mandatory helmet laws. This research design would be an example of a(n) _____ design.
A)true experiment
B)single case
C)interrupted time series
D)control series

Question

Quizplus · Accepted Answer

The research design is a control series design because it involves comparing the effect of an intervention (mandatory helmet law) in one group (state with the law) to control groups (states without the law) over time.

A Researcher Records the Number of Motorcycle Fatalities Before and After