research design

• repeated measures - same participants used in each condition
• independent groups - different participants used in each condition
• matched pairs - different but similar participants used in each condition
• repeated measures strengths - P variables kept constant

  -fewer Ps needed
• repeated measures weaknesses - order effects (boredom, fatigue, practice - affecting 2nd result)

  -demand characteristics - Ps doing both conditions may guess aim

  -different tests need to be made, at same difficulty
• independent groups strengths - no order effects

  -less likely for demand characteristics

  -same test can be used
• independent groups weaknesses - P variables are different so don't know DV came because of IV

  -more Ps needed
• matched pairs strengths - P variables kept constant

  -no order effects

  -less demand characteristics

  -same test used
• matched pairs weaknesses - difficult to match P variables

  -time consuming to match Ps

  -more Ps needed