Essay
Segall, Campbell, and Herskovits administered the Müller-Lyer test to children and adults in several African countries, the Philippines, and the United States. They found that people living in highly carpentered cities were more susceptible to the illusion than people living in rural, less carpentered villages. Why was their study weak in terms of its internal validity?
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Because their study was plagued by (and ...View Answer
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