experimental design

• Independent groups — An experimental design where participants take part in only one experimental condition.
• Repeated measures — An experimental design where participants take part in both the control and experimental conditions.
• Matched pairs — A form of independent groups design where the experimental and control participants are deliberately similar e.g. there is a balance between gender and IQ levels in each group/condition.
• strengths of m.p design include less chance of participant variables and less chance of demand characteristics
• weaknesses of m.p include the risk of order effects (practice and fatigue) and needed a higher number of participants than r.m
• strengths of r.m include a lower number of particpants than i.g and no chance of ppt variables
• weaknesses of r.m include a risk of demand characteristics and order effects
• strengths of i.g include no order effects and less chance of demand characteristics
• weaknesses of i.g include a higher number of ppts and risk of unknown ppt variables