to do


  • find review on ad
  • reliable = repeatable
  • observers (several)
  • valid = believable
  • do we trust the source?
  • internal validity
    • murder photos
    • focus group
    • very upsetting
    • very good internal validity as stress producers
  • external validity
    • history exam
    • cramming vs several weeks revision
    • valid in another context (e.g. in another context)

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