Question: 8.22 The Community Intervention Trial for Smoking Cessa- tion asked whether a community-wide advertising campaign would reduce smoking. The researchers located 11 pairs of com-

8.22 The Community Intervention Trial for Smoking Cessa- tion asked whether a community-wide advertising campaign would reduce smoking. The researchers located 11 pairs of com- munities, each pair similar in location, size, economic status,

and so on. One community in each pair participated in the ad- vertising campaign and the other did not. This is

(a) an observational study.

(b) a matched pairs experiment.

(c) a completely randomized experiment.

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