Exam 1 Part 12 Flashcards
Allow the tester to compare the abilities of the test taker to the appropriate normative people
Scaled scores
Tells how many standard deviations the raw score is from the mean from a normative sample
Z-score/Standard score
Why is the standard score/z-score important?
shows where an individual score lies along the continuum of the bell-shaped curve, and thus tells how different the test taker’s score is from the average
A score based on a 9-unit scale, where a score of 5 describes average performance
Stanine
Tells the percentage of people scoring at or below a particular score
Percentile rank
What is the least useful and most misleading score ranking?
Age and grade equivalents
A standard score is the _____.
Mean
The range of normal standard scores on a test measure is generally ___ to ___
85 to 115
A standard score of 100 = a percentile rank of __
50
A scaled score of 10 = percentile rank of __
50
Square root of the variance; describes the dispersion of a set of scores around the mean of the distribution.
Standard deviation
The normal range of scaled scores for individual subtests is generally __-__.
8 to 12
Assessment literature generally agrees that scores falling at or below ___ to ___ standard deviations from the mean are thought to be abnormal enough to be clinically significant.
-1.5 to -2.0
Represents the degree of certainty on the part of the test developer that the statistical values obtained are true
Confidence interval
For a child to be considered needing clinical intervention they must pass ___ standard deviations
-1.5
