Control groups



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Control problems in experimental research

Week E

Today’s questions

  • Last week, we understood what experiments are (not)
  • A robust experiment allows strong conclusions to be made.
  • How do we design robust experiments?
  • We control for variables which can upset or compromise our conclusions!

Two basic research designs


Experiment

Between-subjects



Within-subjects

Design & control problems

Control problems in between-subjects designs

Recall: Between-subjects

  • Independent groups are formed.
  • Participants in Group A are not the same participants as those in Group B
  • Conclusions are valid if before the manipulation, Group A ≡ Group B



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