Wide Range Achievement Test Wide Range Achievement Standardization and Norming 2 — Questions and Answers
Question 1: Which type of reliability measures consistency of WRAT scores across two administrations separated by time?
- Inter-rater reliability
- Internal consistency reliability
- Test-retest reliability (Correct answer)
- Parallel forms reliability
Correct answer: Test-retest reliability
Test-retest reliability assesses the stability of scores when the same test is administered twice to the same individuals.
Question 2: What statistical coefficient is most commonly used to report WRAT internal consistency reliability?
- Pearson r
- Cohen's kappa
- Coefficient alpha (Cronbach's alpha) (Correct answer)
- Spearman rho
Correct answer: Coefficient alpha (Cronbach's alpha)
Coefficient alpha (Cronbach's alpha) is used to measure internal consistency, showing how well WRAT items within a subtest correlate.
Question 3: Grade equivalent scores on the WRAT indicate the grade level at which the average student earns what?
- A perfect score on that subtest
- The same raw score as the individual being tested (Correct answer)
- A standard score of 100
- A passing score of 70
Correct answer: The same raw score as the individual being tested
A grade equivalent shows the grade level at which the average student in the normative sample earned the same raw score.
Question 4: What is the purpose of calculating a confidence interval around a WRAT standard score?
- To determine the test's copyright date
- To express the range within which the true score likely falls (Correct answer)
- To convert standard scores to percentile ranks
- To calculate the test's internal consistency
Correct answer: To express the range within which the true score likely falls
A confidence interval expresses the range of scores within which an individual's true score is likely to fall, accounting for measurement error.
Question 5: The standard error of measurement (SEM) on the WRAT is used to calculate what?
- The mean of the normative sample
- The grade equivalent score
- Confidence intervals around observed scores (Correct answer)
- The alternate forms correlation
Correct answer: Confidence intervals around observed scores
The SEM is used to construct confidence intervals, indicating the probable range of error in an observed WRAT score.
Question 6: Age-based norms on the WRAT compare a test-taker's performance to what reference group?
- Students in the same school district
- Individuals of the same age in the normative sample (Correct answer)
- Individuals at the same grade level in the normative sample
- A fixed criterion standard
Correct answer: Individuals of the same age in the normative sample
Age-based norms compare an individual's raw score to others of the same age in the standardization sample.
Wide Range Achievement Test Wide Range Achievement Standardization and Norming 2
Which type of reliability measures consistency of WRAT scores across two administrations separated by time?