A01

• What does experimental design refer to?

  Arrangement of participants in experiments
• What does 'used' mean in the context of experimental design?

  How participants are arranged in conditions
• What are the three types of experimental designs mentioned?

  • Independent groups design
  • Repeated measures design
  • Matched pairs design
• What is an independent groups design?

  Two separate groups experience different conditions
• In an independent groups design, how many levels of the independent variable do participants experience?

  One level of the independent variable only
• What is compared in an independent groups design?

  The mean number of words spoken
• What is a repeated measures design?

  All participants experience both conditions
• What is compared in a repeated measures design?

  The two mean scores from both conditions
• What is a matched pairs design?

  Participants are paired on relevant variables
• Why might participants be matched on IQ in a memory study?

  It indicates their ability to recall information
• What is the purpose of matching participants in a matched pairs design?

  To control for confounding participant variables
• How might participants be selected for a matched pairs design in the SpeedUpp study?

  By observing their interaction before the experiment
• What happens to one participant from each pair in a matched pairs design?

  They are allocated to different conditions
• How is the experiment run in a matched pairs design compared to an independent groups design?

  It is run in the same way as independent groups