Mechanical ability of morons

Abstract

A group of 100 boys ranging in chronological age from 10.5 to 20 and in IQ from 50 to 75 at the Minnesota State School for feeble-minded were given sets I and II of the Minnesota mechanical assembly test. The average percentile on the mechanical assembly test for this group was 15.85, and 52% scored below the fifth percentile; however, the distribution overlaps the entire range of a normal population. (PsycInfo Database Record (c) 2025 APA, all rights reserved)