Last year the state increased the speed limit on one section of a 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)a time-series design.
B)an interrupted time-series design.
C)a cross-sectional design.
D)a longitudinal design.

Question

Quizplus · Accepted Answer

This is an interrupted time-series design because there was a specific event (the increase in the speed limit) that interrupted the data collection process. The researcher collected data before and after the change to evaluate its effect.

Last Year the State Increased the Speed Limit on One