Chirowodza and colleagues' study of the effectiveness of HIV prevention strategies in Zimbabwe; Ellis, Marsh, and Craven's study of peer support programs in Australia; and Janzen and colleagues' study of mental health consumer-run organizations in Ontario, Canada all illustrated:
a. nonequivalent comparison group designs
b. randomized field experiments
c. case studies using qualitative and quantitative methods
d. use of geographic information systems
Question 2
Biglan et al. (1996) studied whether store clerks in eight Oregon towns were willing to sell tobacco products to minors. They measured clerk behavior repeatedly over time, implemented a positive reinforcement intervention at different times in different towns, and usually found a drop in willingness to sell after implementing this intervention. What research methodology did they use?
a. multiple baseline design.
b. interrupted time-series design.
c. nonequivalent comparison group design.
d. both a and b
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