The intercorrelations among four psychological tests for a group of mildly mentally retarded Mexican-American children

Date

1968

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Abstract

The purpose of this study was to investigate the degree of relationship among the Stanford Binet Intelligence Scale Form L-M (SB L-M) (1960), the Coloured Progressive Matrices (CPM) (1956), the Goodonough Draw-a-Man (D-a-M) (1926), and the Bender Gestalt Test (BG) (1939) for a group of mildly mentally retarded children of Mexican-American descent. The subjects were thirty-one male and female Mexican- American children in two classes for the Educable Mentally Retarded in the Houston Independent School District. The subjects, 16 males and 15 females, ranged in chronological age from 120 months to 162 months with a mean of 139.5 months and a standard deviation of 12.5 months. There was no significant difference in CA between the sexes. The SB Form L-M MAs of the subjects ranged from 68 months to 120 months with a mean of 84.55 months and a standard deviation of 12.50 months. There was no significant sex difference in mental ages. The subjects were apparently free from sensory and neurological impairments. The subjects were from relatively homogeneous socio-economic backgrounds. All subjects were bilingual. The SB Form L-M, the CPM, the D-a-M, and the BG were individually administered by the examiner. The order in which each test was given to each subject was in block randomization. Each test was administered in a different session with twenty-four hours between sessions for each subject. The SB L-M and the CPM tests were scored by the examiner. The other two tests were scored by a qualified examiner who used the original Goodenough scoring for the D-a-M and the Koppitz Developmental Scoring System for the BG. Mean male and female CPM raw scores were tested for any significant sex difference and no significant sex difference was found: a t-ratio of .321 was obtained. A t-ratio of .342 was obtained for the mean male and female D-a-M MAs in months, indicating there was no significant sex difference. On the BG mean male and female raw scores, a t-ratio of 1.37 was found, indicating no significant sex difference. Thus no significant sex differences were found for any of the four tests used in this study. (The null hypothesis was not rejected.) Pearson product moment correlation coefficients were computed among the four tests. The highest correlation obtained was between the SB L-M MAs (in months) and the CPM raw scores, which was .627 (significant at the .05 level of confidence). The SB L-M correlations with the D-a-M MAs (also in months) and the BG raw scores (in errors) was .317 and -.342, respectively. Neither correlation was significant. The CPM, D-a-M and BG intercorrelations were significant, but moderate. The CPM raw scores and the BG raw scores correlated -.427. The CPM raw scores and the D-a-M MAs correlated .576. The r obtained between the D-a-M MAs and the BG raw scores was -.576. The correlations with the BG are negative because the BG is scored in terms of errors. The correlations between the SB L-M and the BG, and the SB L-M and the D-a-M were not significant (the null hypothesis was not rejected). The correlations between the SB L-M and the CPM were significant (the null hypothesis was rejected). The correlations between the CPM and the D-a-M, the CPM and the BG, and the BG and the D-a-M were significant (the null hypothesis was rejected).

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Keywords

Mexican American children, Testing, Children with mental disabilities

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