Sample Data
“Conclusions”
M1 - M2
difference score is
extremely positive
M2 - M1
difference score is
extremely positive
M1 - M2
difference score is
not extreme
μ1 > μ2
True State of the World
μ1 > μ2
μ2 > μ1
Correct Conclusion “Reversal” error
μ2 > μ1
“Reversal” error
Correct Conclusion
No conclusion as
to whether μ1 >
μ2 or μ2 > μ1
“Wasted
Opportunity”
“Wasted
Opportunity”
This table was suggested by
Andrew J. Waters
Associate Professor
Department of Medical and Clinical Psychology
Uniformed Services University of the Health Sciences