In this assignment, you will review several cases of study designs. Based on concepts you’ve learned about internal validity so far, you should identify and describe the threats to internal validity that are presented in this case.
Review the following three cases below. For each one, answer the following questions:
1. What threat(s) to internal validity are presented in this proposed study design? Explain why.
2. If you were consulting for this research team, how would you advise them to change their study design to minimize the identified threats to internal validity?
