Ppts are allocated to different groups where each group represents a different experimental condition
Evaluate ‘independent groups’
Strengths: no order effect & no fatigue
Weaknesses: ppt variables & more ppts needed
Define ‘repeated measures‘
All ppts take part in all conditions of the experiment
Evaluate ‘repeated measures‘
Strengths: no ppt variables & less ppts needed
Weaknesses: order effects, fatigue & answers could be learnt
Define ‘matched pairs’
Pairs of ppts are matches based of variables that may affect the DV the each is assigned to a condition
Evaluate ‘matched pairs’
Strengths: low ppt variables & no order effect
Weaknesses: time consuming & expensive
Define ‘random allocation’
An attempt to control for ppt. variables in an independent groups design which ensures each ppt. has the same chance if being in one condition as any other
Define ‘counterbalancing’
An attempt to control for the effects of order in a repeated measures design by having half the ppts experience the conditions in one order and the other half in the opposite order
