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)interrupted time-series design
C)cross-sectional design
D)longitudinal design

Question

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)​interrupted time-series design
C)cross-sectional design
D)​longitudinal design

Quizplus · Accepted Answer

This study design is an interrupted time-series design which involves observing the effect of an intervention (increased speed limit) by collecting data before and after the change.

Last Year,the State Increased the Speed Limit on One Section