After reading Chapter 6 in Gravetter, F. J., & Forzano, L. B. (2018). Research Methods for the Behavioral Sciences (6th ed.). Belmont, CA: Wadsworth Publishing. ISBN: 978-1-337-61331-6 answer the following questions:

1. What is the difference between internal and external validity? Give an organizational example.
2. What is the difference between a confound variable and an extraneous variable? Given an organizational example.
3. List and briefly define the threats to internal and external validity identified in Chapter 6.
4. Which research strategies have strong internal validity? Which research strategies have strong external validity?