Experiments

• 3 types of experimental design

  Repeated measures

  Matched participants

  Independent measures
• Quasi experiments 


  useful when impractical or unethical to generate conditions for IV- making use of changes or differences to provide experimental conditions
• Strength of quasi experiments

  Behaviour in natural environment

  less likely for demand characteristics to affect results

  used when unethical to create conditions
• Weaknesses of quasi experiments

  no control over extraneous variables

  can be ore expensive and time consuming
• Field experiments 


  setting in participants normal environment, still contain IV and DV
• Strengths of field experiments

  natural environment will encourage natural behaviour