There is an increasing body of psychological literature that shows humans change the way they behave if they think they are being watched, and that this effect can be triggered by models of humans and even posters of human faces or eyes. You are interested in whether putting up posters of human faces in local parks will increase the degree to which people clean up after their dogs. There are 20 local parks which you have permission to use for your study. Describe how you might design this study as both a within-subject design and a between-subject design, outlining the pros and cons of each in this context. What would your controls be in this study?

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