NNAT3 Scoring and Interpretation of Results 2 — Questions and Answers
Question 1: What does a Naglieri Ability Index (NAI) of 100 signify?
- Performance exactly at the national average for the age group (Correct answer)
- A perfect score on all subtests
- Qualification for gifted program enrollment
- Performance in the top 10% nationally
Correct answer: Performance exactly at the national average for the age group
An NAI of 100 represents exactly average performance, placing the student at the 50th percentile nationally.
Question 2: Which statistic describes the percentage of students in the normative sample who scored at or below a given raw score?
- Percentile rank (Correct answer)
- Standard score
- Stanine
- Normal Curve Equivalent
Correct answer: Percentile rank
A percentile rank indicates what percentage of same-age peers in the norm group scored at or below that student's score.
Question 3: On the NNAT3, what is the standard deviation of the Naglieri Ability Index?
- 15 (Correct answer)
- 10
- 20
- 16
Correct answer: 15
The NAI is scaled with a mean of 100 and a standard deviation of 15, consistent with most ability tests.
Question 4: A student's NNAT3 score report shows a stanine of 9. What does this mean?
- The student scored in the highest performance band (Correct answer)
- The student scored exactly at the mean
- The student needs additional support services
- The student answered 9 questions correctly
Correct answer: The student scored in the highest performance band
Stanine 9 is the highest of the nine stanine bands, representing the top approximately 4% of performers.
Question 5: How are raw scores converted to Naglieri Ability Index scores on the NNAT3?
- Through age-based norm tables that convert raw scores to standard scores (Correct answer)
- By multiplying correct answers by a fixed factor of 3
- By comparing raw scores directly between students in the same class
- By averaging subtest scores without any age adjustment
Correct answer: Through age-based norm tables that convert raw scores to standard scores
Raw scores are compared to the performance of a nationally representative age-matched normative sample using conversion tables.
Question 6: What term describes the range of scores within which a student's true score likely falls, accounting for measurement error?
- Confidence interval (Correct answer)
- Raw score band
- Percentile range
- Stanine bracket
Correct answer: Confidence interval
A confidence interval (e.g., 95% CI) provides a range around the obtained score reflecting the standard error of measurement.
Question 7: Which NNAT3 score type is most useful for comparing a student's performance across different test administrations or to other standardized tests?
- Naglieri Ability Index (standard score) (Correct answer)
- Raw score
- Number of items attempted
- Class percentile
Correct answer: Naglieri Ability Index (standard score)
Standard scores like the NAI are normalized and comparable across administrations because they reference the same national norm group.
NNAT3 Scoring and Interpretation of Results 2
What does a Naglieri Ability Index (NAI) of 100 signify?