The Community Intervention Trial for Smoking Cessation asked

The Community Intervention Trial for Smoking Cessation asked whether a community-wide advertising campaign would reduce smoking. The researchers located 11 pairs of communities, each pair similar in location, size, economic status, and so on. One community in each pair participated in the advertising campaign and the other did not.

A. a completely randomized experiment.

B. an observational study.

C. a matched pairs experiment.

Solution

As we can see from the sentence \"The researchers located 11 pairs of communities, each pair similar in location, size, economic status, and so on.\", we see that this is

OPTION C: A matched pairs experiment. [ANSWER]