A Researcher Records the Number of Motorcycle Fatalities Before and After

Multiple Choice

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