EXPERIMENTAL DESIGNS

• ADVANTAGES OF IG?

  • time efficient
  • no order effects
• WHY ARE IG TIME EFFICIENT?

  no prior matching, conditions can occur at same time
• WHY DO IG HAVE NO ORDER EFFECTS?

  participants only experience one condition each
• DISADVANTAGES OF IG?

  • poor control of participant variables
  • expensive
• WHY ARE IG EXPENSIVE?

  twice as many participants needed
• HOW TO CONTROL PARTICPANT VARIABLES IN IG?

  random allocation
• ADVANTAGES OF RM?

  • no participant variables
  • cost-effective
• WHY ARE RM COST-EFFECTIVE?

  half number of participants needed
• DISADVANTAGES OF RM?

  • order effects
  • demand characteristics
  • time consuming
• HOW TO REDUCE ORDER EFFECTS/ DEMAND CHARACTERISTICS IN RM?

  counterbalancing, deception
• ADVANTAGES OF MP?

  • reduced participant variables
  • no order effects
• DISADVANTAGES OF MP?

  • very time consuming
  • if a participant drops out, data lost from two people
• HOW TO REDUCE TIME TAKEN IN MP?

  reduce sample size (but then results are less generaliseable)