Sets of randomly generated numbers are used to produce simulated data sets to illustrate that high heritability of a property within each of two populations may be consistent with a vanishingly small heritability in the combined population. (A response by Jensen appears in the next issue of Journal of Educational Statistics, p.385). (CTM)

Methodological tools such as analysis of variance designs can reflect bias. Difficulties in the interpretation of cross-cultural differences can be avoided only if the researcher considers all external variables which account for the variance. No variance should be left to be explained in terms of culture. (VM)

Content of school problems as posed by high school students, quality with which questions were formulated, and the relationship of content and quality to students' intellectual characteristics were investigated. Results reveal problem content most involved affectivity of teachers; problem formulation quality was egocentric; and content and quality…

Some specific intellectual abilities show consistent sex differences which vary in degree according to types of tests and samples examined. Reviews the empirical support for these differences, as well as the methodological difficulties, data and sampling limitations, interpretative biases, and contradictory results of much of the sex-difference…

Groups of retarded and nonretarded children were investigated as they learned three rules underlying problems adapted from the Raven Progressive Matrices Test: rotation, imposition, and subtraction. Results were seen as consistent with theories that emphasize transfer flexibility as one potential source of individual and comparative differences in…