Observed test scores
3 important questions on Observed test scores
What do we mean by the weighted test score of a test taker?
- some items differ in importance.
- so weight is assigned to different items to make them count more.
What is the formula for the weighted test score?
WS = Σ wk x Xjk
What do the correlation and the covariance say about the items?
- correlation and covariance are measures of association
- when you find high correlation/covariance it is likely that the items measure the same construct
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