WAIS - Wechsler Adult Intelligence Scale Psychometric Properties and Norms Questions and Answers

Question 1

The WAIS-IV Technical and Interpretive Manual reports an average internal consistency reliability coefficient of .98 for the Full Scale IQ (FSIQ).
Which of the following is the most accurate interpretation of this statistic?

Accepted Answer

98% of the variance in FSIQ scores is attributable to true score variance.

Answer

The test is 98% free from cultural bias.

Answer

98% of individuals will receive the same FSIQ score if retested.

Answer

The WAIS-IV accurately measures 98% of the total construct of intelligence.

Question 2

An examinee obtains a Perceptual Reasoning Index (PRI) score of 112. Using the standard error of measurement (SEM), the examiner determines the 95% confidence interval is 105-118. What is the correct way to interpret this confidence interval?

Accepted Answer

The examiner can be 95% confident that the examinee's true PRI score falls within the range of 105 to 118.

Answer

There is a 95% probability that the examinee's score is exactly 112.

Answer

If the examinee were retested 100 times, their score would be between 105 and 118 on exactly 95 of those occasions.

Answer

The examinee's true ability is guaranteed to be within the High Average range.

Question 3

Factor analysis of the WAIS subtests consistently supports a hierarchical model with a general intelligence factor ('g') at the top and more specific abilities (the indices) below. This type of statistical evidence primarily supports which psychometric property of the test?

Accepted Answer

Construct validity

Answer

Test-retest reliability

Answer

Content validity

Answer

Inter-rater reliability

Question 4

Which of the following is the most critical feature of the WAIS standardization sample for ensuring an individual's scores are accurately interpreted relative to their peers?

Accepted Answer

The sample was stratified to match recent U.S. Census data on key demographic variables.

Answer

The sample included over 2,200 individuals, ensuring a large comparison group.

Answer

The sample was collected across multiple years to ensure temporal stability.

Answer

The sample was screened to exclude individuals with known psychiatric conditions.

Question 5

A clinician finds a 20-point difference between an examinee's Verbal Comprehension Index (VCI) and Processing Speed Index (PSI). To determine if this discrepancy is not just statistically significant but also clinically meaningful, the clinician should consult the WAIS manual to determine the:

Accepted Answer

base rate of this difference in the normative sample.

Answer

correlation coefficient between the VCI and PSI.

Answer

standard error of measurement for each index.

Answer

reliability coefficient of the Full Scale IQ.

Question 6

In the standard scoring convention for the WAIS, what are the respective mean (M) and standard deviation (SD) for individual subtest scaled scores and for the Full Scale IQ (FSIQ)?

Accepted Answer

M=10, SD=3 for subtests; M=100, SD=15 for FSIQ.

Answer

M=100, SD=15 for subtests; M=100, SD=15 for FSIQ.

Answer

M=50, SD=10 for subtests; M=100, SD=15 for FSIQ.

Answer

M=10, SD=5 for subtests; M=100, SD=10 for FSIQ.

The WAIS-IV Technical and Interpretive Manual reports an average internal consistency reliability coefficient of .98 for the Full Scale IQ (FSIQ).Which of the following is the most accurate interpretation of this statistic?

The WAIS-IV Technical and Interpretive Manual reports an average internal consistency reliability coefficient of .98 for the Full Scale IQ (FSIQ).
Which of the following is the most accurate interpretation of this statistic?