Slosson Intelligence Test

The manual states that the purpose of the Slosson Intelligence Test is to serve as a quick estimate of general verbal cognitive ability or index of verbal intelligence. Although reviewers have described it as a brief screening measure of verbal crystallized intelligence, the manual presents appropriate cautions about interpretation of the Slosson Intelligence Test as a screening measure, suggesting at several points that follow-up assessment is necessary to corroborate Slosson Intelligence Test results.

Scoring: The Slosson Intelligence Test is easy to administer and score. The test contains 187 untimed items assessing the cognitive domains of vocabulary, general information, similarities and differences, comprehension, quantitative ability, and auditory memory. All the items are presented in question and answer format. The raw score is computed by adding the highest item in the basal to the number of correct responses after the basal.

Purpose:The Slosson Intelligence Test is designed for use as a quick estimate of general verbal intelligence.

Population: Ages 4-0 and over.

Scores: Total score only.

Time: (10-20) minutes.

Authors: Richard L. Slosson, Charles L. Nicholson (revision), and Terry H. Hibpshman (revision).

Publisher: Slosson Educational Publications, Inc.

Reliability: Kuder-Richardson 20 reliability coefficients by age level range from .88 to .97, indicating a high degree of inter-item consistency. Test-retest reliability is reported to be .96, based on a weak sample size of 41 and a one-week administration interval. Split-half reliability, calculated using the Spearman-Brown correction and the Rulon procedure, was .97 for the entire sample.

Validity: Concurrent criterion-related validity is based on correlations between the Slosson Intelligence Test total standard score and the WAIS-R and the WISC-R IQS. In a study of 10 subjects, significant correlations were found between TSS and three IQ scores on the WAIS-R. Comparisons with the WISC-R were made utilizing 234 subjects between the ages of 6 and 16. At each of four age levels the TSS correlated significantly with each of the WISC-R IQS.

Norms: The sample approximates the percentages found in the United States in terms of geographic region, occupational category, educational level, gender, and race. Minorities are under represented in the standardization sample as are those living in areas with populations below 5,000 and above 500,000.

Suggested Uses: It is recommended that the Slosson Intelligence Test is suitable for screening purposes, although reviewers recommend using the short form of other comprehensive intelligence test batteries that are more psychometrically sound.

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