Psychometrics: Observed test scores Flashcards
1
Q
What is meant by scoring by fiat?
A
Giving scores to different responses and has no theoretical
justification.
2
Q
How is the observed test score derived?
A
The observed test score is derived from the item scores by taking the unweighted or the weighted sum of the item scores
3
Q
How is the construct score derived?
A
The construct score is derived from the item responses under the assumption of a latent variable response model.
4
Q
What is meant by the expected score?
A
Population mean of observed scores
5
Q
What is the item mean of dichotomous items?
A
The proportion
6
Q
How do you get the standard deviation?
A
Square the variance
7
Q
What is meant by covariance?
A
The measure of how much two variables vary together
