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Trafton, Richard S.; Garrison, William T. – 1982
The research question addressed was whether sex differences in cognitive ability are smaller in younger age groups than in older age groups. A battery of 12 aptitude tests measuring visualization, spatial orientation, perceptual speed, associative memory, number memory, eidetic memory, spatial scanning, visual memory, and flexibility of closure…
Descriptors: Age Differences, Cognitive Ability, Cognitive Measurement, Comparative Analysis
Jensen, Arthur R. – 1979
The uses of data on siblings for educational and psychological research purposes are explained. Examples are based on empirical data. Five types of research problems, using sibling data, are explored: (1) statistical control of family background variance in psychological or educational studies which use analysis of covariance (ANCOVA) or multiple…
Descriptors: Age Differences, Analysis of Covariance, Cognitive Measurement, Correlation
