Committees kill more than ________ of the bills submitted in Congress.

Focus groups can be useful when they

a. are suitable substitutes for opinion polls. b. can help pollsters draft questionnaires. c. reach the largest possible portion of the electorate. d. reflect deliberative opinions. e. show long-term trends in public sentiment.

A researcher conducts four surveys over 4 months measuring voters’ support for a proposed policy in his county. What kind of study is this an example of?

A. trend B. cohort C. panel D. cross-sectional