Scoring Accuracy and Norms Flashcards
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Read the first 7 Scoring Accuracy and Norms flashcards as text
A psychometrist is double-checking hand-scored responses on a Bender Gestalt. Which step best reduces scoring errors on this type of test?
Answer: Rescoring independently and comparing to the original scoring using the manual criteria
Independent rescoring using published criteria and comparing results is the recommended method for verifying accuracy on performance-based, manually scored tests.
A composite standard score has a 95% confidence interval of 88–98. What does this interval tell the clinician?
Answer: If testing were repeated many times, 95% of such intervals would capture the true score
A 95% confidence interval means that if the procedure were repeated under identical conditions, 95% of the computed intervals would contain the true score.
What is a stanine score of 5 most equivalent to in terms of performance level?
Answer: Average
Stanine 5 is the middle stanine and corresponds to the average range of performance (approximately the 40th–59th percentile).
A psychometrist calculates a processing speed index and notices it is 2 SD below the mean. Expressed as a standard score (mean=100, SD=15), this score would be approximately:
Answer: 70
Two standard deviations below the mean on a scale with mean=100 and SD=15 equals 100 − (2×15) = 70.
Which factor in the standardization process most directly ensures that norm tables remain valid across test administrations in different geographic regions?
Answer: Proportional representation of demographic variables matching the U.S. Census
Proportional representation of Census-matched demographic variables ensures the normative sample reflects the diversity of the national population, supporting score generalizability.
A psychometrist scores a memory test and finds the examinee's raw score falls below the lowest value in the norm table. Which action is appropriate?
Answer: Assign the lowest tabled scaled score and note the floor effect
When a raw score falls below the tabled range, the psychometrist assigns the lowest tabled score and documents that the true ability level may be lower than the score indicates due to a floor effect.
After completing a neuropsychological battery, a psychometrist computes 18 different index scores. Why does the probability of at least one spuriously significant discrepancy increase with more comparisons?
Answer: Because multiple comparisons inflate the familywise Type I error rate
Each additional statistical comparison increases the cumulative probability of a false positive; this inflated familywise error rate means discrepancies must be interpreted cautiously in large batteries.