Experimental design

• what are the 3 types of experimental design?

  1. repeated measures
  2. matched pairs
  3. independent groups
• what is a repeated measure experiment?

  where all the participants take part in each condition
• what is a matched pairs experiment?

  participants are placed into pairs based of a key variable like age , 1 member of each pair is then placed into each condition
• what is an independent group experiment?

  when you have 2 separate groups that are randomly allocated and each group does 1 condition
• what are some advantages of repeated measures?

  1. fewer participants
  2. cheaper
  3. less time needed
  4. reduces participant variables
• what are some disadvantages of repeated measures?

  1. practice effect
  2. order effects
  3. fatigue / boredom
• what are some advantages of matched pairs?

  1. no order effects
  2. no participant variables
  3. no demand characteristics
  4. increased validity
• what are some disadvantages of matched pairs?

  1. impossible for exact match
  2. more participants
• what are some advantages of independent groups?

  1. no order effects
  2. reduced demand characteristics
  3. increased validity
• what are some disadvantages of independent groups?

  1. more participants
  2. participant variables