What are the threats to the internal validity of a research design (Critical review of literature)??

Описание: Recognizing threats to internal validity of a research design will improve the outcomes and impact of your research; and help you in critically analyzing literature read as part of the literature review.
In this video, using simple and easy to understand examples, I explain:
What is internal validity?
What is the difference between internal and external validity?
What are the threats to the internal validity of a research design?

The next video (link provided below) will explain the threats to the external validity of a research design.

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