The national speed limit in the United States was reduced to 55 mph in 1974. Proponents and critics of this legislation have looked at the number of traffic fatalities on major U.S. highways (e.g., I-90, I-65, and I-75)for the years preceding and following this legislation. Sonny examined the traffic fatalities on each of the major U.S. highways for every year from 1968 to 2005. Sonny used a:
A)pretest-posttest one-group design.
B)time-series design.
C)multiple time-series design.
D)nonequivalent control group design.
E)one-shot case study.

Question

Quizplus · Accepted Answer

A multiple time-series design is the best choice for this study because it allows for the examination of multiple highways over time and the comparison of trends before and after the legislation. This design also takes into account any other factors that may have affected the outcomes, such as changes in highway infrastructure or vehicle safety features over time.

The National Speed Limit in the United States Was Reduced