Psychology 2800E Lecture Notes - Lecture 9: Statistical Conclusion Validity, Internal Validity, Confounding

• School: Western University
• Department: Psychology
• Course: Psychology 2800E
• Professor: Patrick Brown

Document Summary

Threats to validity researchers description can be wrong in a variety of ways problems that cause our descriptions to be wrong are problems of validity validity: researcher"s conclusion drawn by researcher is true and corresponds with reality. Statistical conclusion validity: was the change in the dv caused by the iv or just by chance? if by chance, then the change was not caused by the iv. Construct validity: whether it measures want it is intended to measure does the iv variable capture the theoretical cause does the dv variable capture the theoretical e ect. ** a di operationalization might produce di conclusions can sometimes address the issues with a manipulation check: an aspect of the experimental design meant to check that the variables change in the intended way. Threats to internal validity (single group designs) {pre-test --> treatment --> post-test} History: external changes outside of the lab that in uence the results of the experiment.