Key Issues

In this chapter, we address five questions:

In this chapter, we address the following questions:

1. How do randomized laboratory experiments establish internal validity?

2. How can single-n studies establish internal validity?

3. What factors may threaten a single-n experiment's internal, external, and construct validity?

4. What are Campbell and Stanley's 8 threats to internal validity?

5. How do quasi-experimental designs deal with the 8 threats to internal validity?

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