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The internal validity of the Pre-post designs is threatened by threats related to time. A : true B : false.

The internal validity of the Pre-post designs is threatened by threats related to time. A : true B : false.
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The internal validity of the Pre-post designs is threatened by threats related to time. A : true B : false.

User Jmcastel
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1 Answer

4 votes

Answer:

A. true

Step-by-step explanation:

User Johnkeese
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