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Social Science
Psychology
Psychometrics
EDUC-434
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Terms in this set (22)
When is the mode the best measure of central tendency
nominal data
When is the median the best measure of central tendency
ordinal
When is the mean the best measure of central tendency
interval/ratio
If the data is positively skewed
median
always at the 50th percentile
median
The sum of the deviation scores
always 0
How do you compute the deviation score?
X-mean
A deviation score of 2 indicates that
the X(score) is 2 above the mean
What measure of variability is used with ordinal data
Range
SS stands for the
sum of squared standard deviation scores
Deviation score is
the distance of each individual score from the mean
Standard deviation is
The typical distance of all the scores from the mean
For sample variance, n-1 is for
to correct for underestimation of the variability of a population
scores which measure performance in terms of school
grade level
grade equivalents
percentage of a group that fell below a given score
percentile rank
two advantages of reporting scores in terms of percentile rank
- allows comparison of a student with others his own age or in the same grade.
-Fairly easy to explain to parents
2 advantages of stanines over other standard scores
-they require only one digit to represent a band of scores
-over-interpretation is reduced, small differences in scores are ignored
Does it match your objective
content validity
Norm group similar to your students
similar norm group
Consistent ranking of individuals
reliability
reveals true achievement levels
accuracy
all students have the same procedure
standardized procedure
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