![]() For instance, a “Moos Family Environment Scale” was used to compare the impressions of the participants’ childhoods and a questionnaire was given to measure access to physical facilities, such as material possessions and cultural, mechanical and scientific goods. To control for confounding variables in the environment, rigorous data was gathered on the childhood environments of the participants. Controls were also established, like conducting the IQ tests on the twins at the same time but in different rooms under strict supervision by researchers.Ĭan you think of any ethical issues with this study? And two different researchers conducted similar tests on the same participants. For instance, when measuring IQ, three different IQ tests were used to gather and triangulate the data. Methods were triangulated, either using researcher triangulation or methodological triangulation. Physical and psychological data was gathered in a number of different ways, which took around 50 hours. The twins spent an average of 5 months together before being separated and reunited (on average) around 30 years of age.
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