PSYCH339 Lecture Notes - Lecture 4: Performance Appraisal, Discriminant Validity, Criterion Validity

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10 Aug 2016
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IQobserved = 187
What is his z-score?
Z= (187-100)/15
= 5.8
Sheldon has a higher IQ than 99.99% of other people
Approximate 4 out of
What is Sheldon’s true score?
Reliability: variance of the true score
IQbsereved = 187
Mean = 15
Rxx = 0.9
SEM = 15 sqrt 1-0.90
SEM = 4.74
95% CI = ~9.5 (4.74x2)
So Sheldon’s “true” IQ is probably between about 177.5 (187 – 9.5) and 196.5 (187 +
9.5)
Cont’d from last class
As a reliability gets higher, the 95% confidence interval goes down to the point
where you get to a perfect reliable test, there is no error so the true score is the
observe score
Can you have accuracy without being consistent? No
Can you have reliability without accuracy? No
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