NNAT3 Scoring and Interpretation of Results 3 — Questions and Answers
Question 1: A gifted program requires an NNAT3 score at the 95th percentile or above. What approximate NAI score would meet this threshold?
- 125 (Correct answer)
- 110
- 115
- 130
Correct answer: 125
The 95th percentile corresponds to approximately NAI 125 given a mean of 100 and standard deviation of 15.
Question 2: When interpreting NNAT3 results, why is it important to consider the confidence interval rather than only the obtained NAI score?
- Because measurement error means the true score may differ from the obtained score (Correct answer)
- Because confidence intervals eliminate the need for percentile ranks
- Because the NAI score alone does not indicate the number of correct answers
- Because confidence intervals replace stanines in modern scoring
Correct answer: Because measurement error means the true score may differ from the obtained score
All standardized tests have measurement error, so the true ability score falls within a range around the obtained score.
Question 3: Which NNAT3 score level classification corresponds to an NAI score between 115 and 129?
- Above average (Correct answer)
- Average
- Well above average
- Superior
Correct answer: Above average
Scores from 115 to 129 are typically classified as 'Above Average' in NNAT3 interpretive guidelines.
Question 4: On the NNAT3, what does it indicate when a student's NAI score is described as 'not interpretable'?
- The student answered too few items to yield a reliable score (Correct answer)
- The student scored a perfect 100
- The student's age fell outside the norming range
- The student skipped all spatial visualization items
Correct answer: The student answered too few items to yield a reliable score
When a student completes too few items (often due to non-attempt or refusal), the resulting score lacks reliability and is flagged as not interpretable.
Question 5: A school psychologist notes that a student's NNAT3 percentile rank is 72. How should this be communicated to parents?
- The student scored higher than 72% of same-age students nationally (Correct answer)
- The student answered 72% of questions correctly
- The student is in the 72nd stanine
- The student's score is 72 points above average
Correct answer: The student scored higher than 72% of same-age students nationally
A percentile rank of 72 means the student outperformed 72% of same-age peers in the national normative sample.
Question 6: Which of the following best explains why two students with the same raw score may receive different NAI scores?
- They were assessed at different ages, resulting in different norm-group comparisons (Correct answer)
- One student used the online form and the other used the paper form
- The scoring algorithm applies a random adjustment factor
- The students attended schools in different geographic regions
Correct answer: They were assessed at different ages, resulting in different norm-group comparisons
NAI scores are age-normed, so the same raw score earns a higher NAI for an older student relative to younger peers if the older group typically scores higher.
Question 7: What is the primary purpose of age-based norming on the NNAT3?
- To ensure fair comparison of students to same-age peers rather than all test-takers (Correct answer)
- To reduce testing time for younger students
- To assign extra credit for older students
- To replace grade-based norms entirely
Correct answer: To ensure fair comparison of students to same-age peers rather than all test-takers
Age-based norms allow scores to reflect how a student performs relative to others at the same developmental stage, ensuring equitable comparisons.
NNAT3 Scoring and Interpretation of Results 3
A gifted program requires an NNAT3 score at the 95th percentile or above.
What approximate NAI score would meet this threshold?