Question: Please explain in full detail. Add IN-TEXT citations and references. 1. What is the difference between internal and external validity? 2. Select two internal validity

Please explain in full detail. Add IN-TEXT citations and references.

1. What is the difference between internal and external validity?

2. Select two internal validity threats and describe each.

3. After examining each category and list of designs, determine which design controls for all threats to internal validity. Explain how this design controls for all threats.

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