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Qian, Gaoyin – 1993
Some methodological issues in the study of levels of knowledge are reviewed, and needs for further research are explored, drawing on an analysis of 12 studies reported since the late 1970s. In the 12 studies, 16 quantitative experiments were conducted. These were assessed for internal and external validity. Analysis revealed some shortcomings in…
Descriptors: Age Differences, Data Collection, Educational Research, Effect Size