Experimental design

Created by

Mya

Cards (10)

What are the different types of experimental design? 
Independent groups design
Repeated measures
Matched pairs design
What is independent groups design? 
Participants are allocated to different groups, each representing one experimental condition.
What is repeated measures design? 
All participants take part in all conditions of the experiment.
What is matched pairs design? 
Pairs of participants are matched on variables that may affect the dependent variable.
What is random allocation? 
An attempt to control for participant variables in an independent groups design.
What is counterbalancing? 
An attempt to control for order effects in a repeated measures design by varying the order of conditions for participants.
What is the evaluation for experimental independent groups design 
Independent groups, STRENGTHS: No order effects and are less likely to guess the aim of the study.
WEAKNESS: Participants who are in different groups are not the same so they may have individual differences (participant variable) so researchers use random allocation
what is the evaluation for repeated measures design 
STRENGTHS: participant variables are controlled and fewer participants are needed
WEAKNESS: Order effect so researchers use counterbalancing, this acts as an confounding variable. Participants can also work out the aim of the study easier because they experience all conditions. Demand characteristics tend to be more of a feature of repeated groups design.
What is an evaluation for matched pairs design 
STRENGTHS: Less order effects and demand characteristics because they only take part in one condition.
WEAKNESS: can never be matched perfectly that may affect the dependent variable, also time consuming
name and explain the types of design
independent: participants in each condition of an experiment are different
Repeated: all participants take part in all conditions
matched pairs: similar participants take part and are allocated to different experimental conditions