Psychometric Properties and Norms Flashcards

The WAIS-IV standardization sample was stratified by which demographic variables?

Answer: Age, sex, race/ethnicity, and education level

The WAIS-IV normative sample was stratified by age, sex, race/ethnicity, and education level to mirror U.S. Census proportions.

What is the test-retest reliability coefficient range typically reported for WAIS-IV composite scores?

Answer: .90 to .96

WAIS-IV composite scores show high test-retest reliability, with coefficients generally ranging from .90 to .96.

Which WAIS-IV index shows the lowest average internal consistency reliability among the four index scores?

Answer: Processing Speed Index

The Processing Speed Index typically shows somewhat lower internal consistency than other indexes because its subtests are timed performance tasks.

A score of 115 on the WAIS-IV FSIQ falls at approximately which percentile rank?

Answer: 84th percentile

An FSIQ of 115 is one standard deviation above the mean, corresponding to the 84th percentile.

What is the primary purpose of age-corrected scaled scores on the WAIS-IV?

Answer: To compare an individual's performance to same-age peers

Age-corrected scaled scores allow comparison of an individual's subtest performance relative to peers in the same age group.

Confirmatory factor analysis of the WAIS-IV best supports which factor structure?

Answer: A four-factor model plus a higher-order g factor

CFA studies support a hierarchical model with four first-order factors (VCI, PRI, WMI, PSI) and a higher-order g factor.

Which statistical concept describes the degree to which WAIS-IV subtests measure the same underlying construct as the composite score?

Answer: Convergent validity

Convergent validity refers to the degree to which measures expected to be related (e.g., subtests and their composite) correlate strongly.