The Houston non-verbal scale : Reliability and standardization on White and Negro populations



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The present study was an empirical exploratory investigation aimed at the development of a test which does not discriminate between whites and Negroes. Standardization and reliability data for the Houston Non-Verbal Scale were obtained on a white and Negro population. The two subtests, Memor yand Directions, and Problem Solving, were evaluated independently, and their relationship with two intelligence tests was explored. Memory and Directions appears to be a test of immediate memory for a set of simple directions, and Problem Solving requires the subject to remember a set of verbal instructions which enables him to solve a problem. Normative data were compiled for a relatively homogeneous semiskilled and skilled industrial populations of sixty-one whites and forty Negroes. No differential performance effect between whites and Negroes was found on Memory and Directions, but on Problem Solving the whites performed better than the Negroes. For the total score the whites obtained a mean of 65.8 and the Negroes a mean of 57.9, a statistically significant differential. It appears that the test as a whole is not equallyy applicable for whites and Negroes. [...]



Nonverbal intelligence tests, African Americans, Intelligence levels