Last year, the state increased the speed limit on one section of highway from 55 to 65 mph. To evaluate the effect of the change, a researcher gathered accident reports for six months before the change and for six months after the change. This is an example of a(n) ____.
A) time-series design
B) pretest-posttest design
C) cross-sectional design
D) longitudinal design

Question

Quizplus · Accepted Answer

This is an example of a time-series design because it involves collecting data at multiple time points before and after a change (the increase in speed limit) to observe the effects of that change over time.

Last Year, the State Increased the Speed Limit on One