BCP Scoring Accuracy and Norms 2 — Questions and Answers
Question 1: A psychometrist scores a 10-subtest battery and finds the sum of scaled scores is 87. What is the next step before converting to a composite score?
- Convert raw scores to T-scores first
- Verify the sum matches the test record form's prorating rules (Correct answer)
- Subtract the mean from each subtest score
- Apply a correction factor for test duration
Correct answer: Verify the sum matches the test record form's prorating rules
Before converting subtest sums to composite scores, the psychometrist must verify the sum is complete and consistent with any prorating rules specified in the manual.
Question 2: Which type of norm group is most appropriate when evaluating a 7-year-old child's reading performance for diagnostic purposes?
- National age norms (Correct answer)
- Grade-equivalent norms
- Local classroom norms
- Criterion-referenced cutoffs only
Correct answer: National age norms
National age norms provide a standardized comparison to same-aged peers, which is most appropriate for diagnostic evaluation of a child.
Question 3: A raw score of 42 corresponds to a percentile rank of 84 in the norm table. What does this mean?
- The examinee answered 84% of items correctly
- The examinee scored higher than 84% of the normative sample (Correct answer)
- The examinee's score is 84 points above the mean
- The examinee is in the 84th stanine
Correct answer: The examinee scored higher than 84% of the normative sample
A percentile rank of 84 means the examinee scored equal to or higher than 84% of individuals in the normative sample.
Question 4: When a normative table provides interpolated values between listed raw scores, what is the psychometrist doing when selecting the correct row?
- Averaging two adjacent scaled scores
- Using the exact row corresponding to the obtained raw score (Correct answer)
- Rounding up to the nearest listed score always
- Applying linear regression to estimate the score
Correct answer: Using the exact row corresponding to the obtained raw score
The psychometrist selects the row that exactly matches the obtained raw score; interpolation is already built into published norm tables.
Question 5: An examiner mistakenly awards full credit on an item that should have received partial credit. What scoring error category does this represent?
- Omission error
- Commission error — over-crediting (Correct answer)
- Clerical transcription error
- Basal rule violation
Correct answer: Commission error — over-crediting
Awarding more credit than warranted is a commission error, specifically over-crediting, which inflates the obtained score.
Question 6: Which statistical property of a norm table indicates how precisely a scaled score estimates true ability?
- Skewness of the raw score distribution
- Standard error of measurement (SEM) (Correct answer)
- Coefficient alpha of the total test
- Interrater reliability of item scoring
Correct answer: Standard error of measurement (SEM)
The SEM quantifies the expected variability around an obtained score, indicating the precision with which it estimates the true score.
Question 7: A norm table is stratified by age in 3-month intervals for children under 6. Why is finer age stratification used for younger children?
- Younger children are harder to test
- Developmental change per unit time is faster in early childhood (Correct answer)
- Older children have higher ceiling effects
- Standardization samples are larger for young children
Correct answer: Developmental change per unit time is faster in early childhood
Because cognitive and developmental abilities change more rapidly in early childhood, finer age bands are needed to produce accurate normative comparisons.
BCP Scoring Accuracy and Norms 2
A psychometrist scores a 10-subtest battery and finds the sum of scaled scores is 87.
What is the next step before converting to a composite score?