Typically, lab experiments have greater internal validity, and field experiments have greater external validity.
What are lab experiments and field experiments?
- A laboratory experiment is one that is carried out under highly controlled conditions (not necessarily in a laboratory), allowing for accurate measurements.
- A laboratory experiment is easier to replicate (i.e. copy).
- This is due to the use of a standardized procedure.
- Field experiments are conducted in the participants' everyday (that is, real-life) environments.
- In a real-world setting, the experimenter still manipulates the independent variable (so cannot really control extraneous variables).
- Because of the natural setting, behavior in a field experiment is more likely to reflect real life, resulting in higher ecological validity than in a lab experiment.
- Lab experiments typically have higher internal validity, while field experiments have higher external validity.
Therefore, typically, lab experiments have greater internal validity, and field experiments have greater external validity.
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