AbstractThis study investigated sex differences on the WISC‐R subtests for retarded males and females who were matched in terms of WISC‐R Full Scale IQs. The sample consisted of 126 children and youth (63 females, 63 males) ranging in chronological age from 7–3 to 8–3, with a mean CA of 7–8. Each subject was matched in terms of Full Scale IQ score. A 2 × 10 analysis of variance with repeated measures on a single factor was used to analyze the data. Students'Tand Fisher'sFratios were calculated, and differences between subtest means were analyzed by Newman‐Keuls test for sample effects. Evidence from the investigation indicated that a significant interaction effect existed between sex and su