S6 - Evaluation key study

• Methodology

  + 2 laboratory experiments on leading questions

  Controlled variables like IV and DV

  Confounding controller (time delay, clips)

  THEREFORE: high internal validity
• Methodology :(

  -Study was artifical as controlled lab

  Use of drive safety video, lacks mundane realism as not reflective of real life

  THEREFORE: Lacks ecological validity
• Sample

  Participants: exp1 45, exp2 150 undergraduates

  
  

  :( - Students in sample may have not been able to drive so difficult to give estimate speeds

  
  

  THEREFORE: questions validity and reliability
• Sample

  :( - All students therefore unrepresentative of EWT and other ages groups

  Younger : prone to misinformation

  Older: inaccurate recall

  THEREFORE: Lacks population validity
• Ethics

  • Psychological harm

  :) - Reduced harm by showing a drive safety campaign to reduce stress

  :( - Some participants may have trauma so video could induce stress
• Deception :(

  • Critical questions and drive safety video
  • Only mild deception and to avoid demand characeristics
• ALT evidence

  • Foster:

  re-call of life robbery is more accurate