21 – External Validity
- Threats to external validity revolve around the generalizability of results.
- When we do research, we can know for sure how the subjects in the sample performed, but can we state that they represent the entire population?
- While there are statistical procedures to help determine this, the best procedure tends to be replication.
- IOW: use the same procedures with different subjects and different experimenters under different circumstances to see if your original results are consistent.