SOCIAL CLASS AND PERFORMANCE ON AN INTELLIGENCE TEST

Noting the wide differences in verbal abilities of middle and lower class children, the investigators proposed that two groups of children, one from the lower class, one from the middle class, who achieve comparable total scores on a group intelligence test, would get their scores by successfully completing different sets of items. In the first study children were placed in social classes based on their fathers’ occupations, following guidelines from the Warner scale. Middle class children were matched with lower class children on total Otis scores. No item‐social class interaction was found. The study was repeated using the occupational categories of the Dictionary of Occupational Titles as a guide to social class standing. Again no item‐social class interaction appeared. If two social class groups are equated on total intelligence scores, one social class sample appears to succeed on essentially the same test items as does the other social class sample. A given score on an intelligence test appears to represent the same skills for one social class as it does for another social class.