Give an example (other than gender) in which a researcher must examine pre-existing groups.

Question 1

  1. Give an example (other than gender) in which  a researcher must examine pre-existing groups.
  2. Question 2 Describe the basic problem that threatens internal validity for nonequivalent group designs.


  3. Question 3 What is the purpose of developmental research designs?


  4. Question 4 How can history threaten the internla validity of a time-series design?

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