In an Experiment, the Main Difference Between Internal Validity and External

question 421

Multiple Choice

In an experiment, the main difference between internal validity and external validity is that

• A)external validity concerns the degree to which the experiment supports clear causal conclusions, whereas internal validity concerns the generalizability of the results
• B)internal validity concerns the degree to which an experiment supports clear causal conclusions, whereas external validity concerns the generalizability of the results
• C)internal validity is based on random sampling, whereas external validity is based on random selection
• D)internal validity is based on random selection, whereas external validity is based on random sampling

---

Definitions:

Free Riders

Individuals who benefit from resources, goods, or services without paying for them or contributing to their provision.

Public Goods Dilemma

A situation in which individuals can benefit from a public good without contributing to its cost, leading to potential under-provision or degradation of that good.

Tragedy of the Commons

A situation in a shared-resource system where individual users acting independently according to their own self-interest behave contrary to the common good, depleting or spoiling the shared resource.

Collective Behavior

Actions or behaviors displayed by a group of people who take collective action in response to an event, situation, or crisis.