Define external validity, Why is it never possible to know

Define external validity

Reference no: EM131321186

1. Define external validity, and indicate its importance to scientific progress.

2. Why is it never possible to know whether a research finding will generalize to all populations of individuals? How do behavioral scientists deal with this problem?

3. What are the four different types of replication, and what is the purpose of each?

Reference no: EM131321186

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