WIAT Norm-Referenced Score Interpretation and Reporting

Question 1

What is the mean (average) standard score for the WIAT normative population?

Accepted Answer

100

Answer

WIAT standard scores are norm-referenced with a mean of 100 and a standard deviation of 15, consistent with most individually administered achievement tests.

Question 2

What is the standard deviation of WIAT standard scores?

Accepted Answer

15

Answer

WIAT standard scores have a standard deviation of 15, so a score of 115 is exactly one standard deviation above the mean of 100.

Question 3

A student earns a WIAT standard score of 115 on the Reading Composite. This score corresponds to approximately which percentile rank?

Accepted Answer

84th

Answer

A standard score of 115 is exactly one standard deviation above the mean of 100, which corresponds to approximately the 84th percentile.

Question 4

Which qualitative descriptor best applies to a WIAT standard score of 85?

Accepted Answer

Low Average

Answer

On the WIAT, standard scores of 80–89 are described as Low Average, placing the score below average but not in the Borderline range.

Question 5

What does a percentile rank of 50 on the WIAT indicate?

Accepted Answer

The student performed better than 50% of same-age peers

Answer

A percentile rank of 50 means the student scored at or above 50% of the normative reference group of the same age, not that they got 50% of items correct.

(WIAT) Wechsler Individual Achievement Test Practice Test

(WIAT) Wechsler Individual Achievement Test Practice Test

WIAT Norm-Referenced Score Interpretation and Reporting