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The concurrent validity of the MVII was investigated with over 1000 vocational high school boys in Grades 9 and 12 in Buffalo, New York, schools. Scores of boys in particular trade curricula were checked against relevant MVII scales. At Grade 12, the food, electrical, and printing trade choices were well predicted; students in building trade, machinist, and mechanical programs were not well spotted. Similar results, but less encouraging, were found for the Grade-9 sample. With 1 student sample only (electrical), aptitude test data were unrelated to MVII scores. Students with "high" academic or shop school averages earned higher MVII criterion scale scores than did others.
A 1% subsample of Project Talent Data Bank's national high school sample provided test score and demographic data for 3,308 Ss. Partial correlation and multiple regression methods were used to test hypotheses concerning birth-order differences in special ability, over and above expected differences due to sex or to socio-economic status. After controlling for socio-economic status and family size, birth order accounted for only 2% of the variance in Vocabulary and English test scores; and birth order accounted for less than 1% of the variance in the Mechanical Reasoning, Visualization, Arithmetic Computation, Clerical Checking, and Object Inspection scores. Sex differences in ability were independent of birth order and socio-economic status.
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