PSY598
Week 3
Reliability: Confidence Intervals
Example: Calculating CIs
• An individual obtains an IQ of 120 on a test that
has a reliability coefficient of .84.
Calculate their 95% CI.
2
Example: Calculating CIs
• A clinical researcher trials a new behavioural
intervention for depression. The primary outcome
measure is a clinical diagnostic interview for MDD
that has a reliability coefficient of .94. At the end of
the trial, the new intervention demonstrates a
T score of 35 on the primary outcome measure.
Calculate the 95% CI for the intervention.
3