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Hamel, B. Remmo; Riksen, Ben O. M. – Developmental Psychology, 1973
Sixty children with mean age 5.10 years were studied. Each member of two groups of 20 nonconservers was given a different kind of verbal rule instruction that was focused on the conservation of discontinuous and continuous quantity. (Editor)
Descriptors: Analysis of Variance, Children, Conservation (Concept), Data Collection