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de Hernandez, Lilian; And Others – Journal of Research in Science Teaching, 1984
Determined that males (N=70) demonstrate higher level of intellectual development than females (N=70), that males mature intellectually earlier than females, and that there appear to be factors other than age and sex that are related to development of formal operational reasoning. Implications of these and other results are discussed. (JN)
Descriptors: Age Differences, Cognitive Development, Developmental Stages, High Schools

Case, Robbie; Fry, Cathy – Journal of Research in Science Teaching, 1973
Studied performance of 15 low-socio-economic-status 14 year olds in learning controlled-experiment design and evaluation, and indicated that experimental subjects significantly outperformed matched controls. (CC)
Descriptors: Academic Ability, Academic Achievement, Critical Thinking, Educational Research