Chapter 3: Test Scores Flashcards
Test score
Number representation of an examinee’s performance on a given test
Raw scores
Number of questions answered correctly on a test
Only used to calculate other scores
Norm samples: what they need to be
Representative of the population taking the test
Consistent with that population
Current (must match current generation)
Large enough sample size
Flynn effect
Intelligence increases over successive generations
In order to stay accurate, intelligence tests must be renormed every couple of years
Types of norm samples
Nationally representative sample (reflects society as a whole)
Local sample
Clinical sample (compare to people with given diagnosis)
Criminal sample (utilizing criminals)
Employee sample (used in hiring decisions)
What test manual contains
Description of norm sample (type and size) Scoring information (type of score used, instructions on how to transform raw scores)
Mean and standard deviation for z scores
M=0
SD=1
Mean and standard deviation for t scores (used for MMPI)
M=50
SD=10
Mean and standard deviation for IQ scores
M=100
SD=15
Percentage of population within 1 standard deviation (normal distribution)
68%
Percentage of population within 2 standard deviations (normal distribution)
96%
Percentage of population within 3 standard deviations (normal distribution)
99%
Example of norm referenced interpretation
30th percentile among 8th graders
Example of grade equivalents
In the 8th grade and performing at a 6.5 grade level
Example of age equivalents
13 and performing at an 11 year-old level