Most data are observational, collected without first imposing an intervention. When relationships are discovered in observational data, it is essential to be careful about what can be said regarding the nature of the relationships and the corresponding conclusions that can be made.
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Notes on the video: Observational Studies
A point to consider for this video:
This video refers to an example of a lurking variable from a previous video. That previous video is Examining Relationships Between Two Categorical Variables in the module Summarizing Data: Relationships Between Variables.