Predictive Power of Economic Experiments

Cialdini's Hotel Towel Field Experiment

Volunteer Bias and External Validity

External Validity Concerns in Single-Subject Research

Generalizing to Individuals in Group Research

Generalizing Across Situations

Mundane Realism

Psychological Realism

Prioritizing Validities

External Validity of Correlational Research

Situational Generalization in Group Research

Which of the following best defines external validity in psychological research?

If a researcher finds that a memory-enhancing technique works for college students in a laboratory setting but fails to work for elderly adults in their own homes, the study is considered to have high external validity.

Match each research scenario with the statement that best describes its impact on the ability to generalize the study's results to other people or situations.

A researcher is evaluating how well results from three different psychological studies can be generalized to the broader population and to real-world settings. Analyze the design characteristics of each study and arrange them in order from the least likely to have high external validity to the most likely to have high external validity.

Imagine you are creating a research protocol to test whether a new memory-enhancing strategy is effective for the general public. To design a study with the highest possible 'external validity', which of the following plans should you construct?

Complementary Nature of Single-Subject and Group Research

Individual Generalization in Group Research

Requirements for Generalization

Suppose you are a peer reviewer for a psychological journal assessing a study that demonstrates a significant effect of a new therapy, but you notice the study was conducted exclusively on a very specific, small group of students in a highly controlled laboratory. To critique the study's lack of generalizability to the broader population and real-world clinical settings, your evaluation would focus on a deficiency in _____ validity.

The ability to generalize the results of a study beyond the specific people and situations that were actually investigated is known as _____ validity.

A researcher wants to study how social pressure affects eco-friendly behavior. Instead of using a sterile laboratory, they conduct a field experiment in an actual hotel, observing whether guests reuse towels. According to the definition of external validity, this study is high in external validity because it allows findings to be generalized to real-world situations beyond a specific laboratory setting.

Match each research scenario or design characteristic with its corresponding impact on external validity, based on how environmental control and setting affect generalization.

Evaluate the following three research designs based on their expected level of external validity. Arrange them in order from the design with the HIGHEST external validity (Order 1) to the design with the LOWEST external validity (Order 3).

Define external validity in the context of psychological research, and identify the two primary aspects of a study that researchers seek to generalize beyond the immediate investigation.

Based on the relationship between environmental control and generalization, diagnose the impact that this highly controlled laboratory setting will have on the study's external validity. Explain how the level of control affects the naturalness of the setting and the ability to generalize these findings.

A psychologist is planning a study to observe how social pressure influences recycling behavior. Apply your understanding of external validity to explain why conducting this study as a field experiment in a public park is more appropriate for generalizing the results to everyday life than conducting it in a laboratory.