Experimental design Flashcards
What is an independent groups design
one group of participants do condition A, second group do condition B
strengths of independent groups design
order effect are not a problem,other ps are less likely to guess aims
weaknesses of independent groups
• participant variables all differ (reducing validity)
• more costly - 2x ps
• more time consuming
what is a repeated measures design
when the same participants take part in all conditions of the experiment
strengths of repeated measures design
• participant variables are controlled
• fewer ps needed
• less time consuming
weaknesses of repeated measures
• order effects (e.g sugar sweet exp)
• repeating tasks could cause boredom
• participants’ performance may improve
• more likely that ps figure out aim
• demand characteristics
what happens in a matched pairs design
two groups of of ps l, but they are related to each other by pairs of p variables (e.g both have autism)
strengths of a matched pairs design
• ps only take part in one investigation
• demand characteristics aren’t a problem
• some attempt to reduce p variables
weaknesses of matched pairs design
• ps can never be matched exactly
• matching pairs is time consuming and costly
