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The addition of a comparison group can address all of the following threats to internal validity EXCEPT:
Lot Codes
Identification codes assigned to a batch of products, facilitating traceability and management of inventory.
Issuance
The action of providing or distributing something officially, such as a document.
Formal Research
Systematic investigation aimed at discovering and interpreting knowledge through a structured approach, such as experiments or surveys.
Scientific Experiment
A systematic investigation conducted to discover, interpret, or revise facts, behaviors, or theories using scientific methods.
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