If a researcher is concerned with having high external validity in their study, she should design a

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A field experiment is the best choice for high external validity because it takes place in a real-world setting and is therefore more likely to reflect real-world conditions and behaviors than a laboratory experiment or survey. Additionally, using a cover story in a laboratory experiment may decrease external validity by influencing participant behavior in a way that may not occur in natural settings.

If a Researcher Is Concerned with Having High External Validity