Experimantal Designs

Question 1

What is an independent group design

Answer 1

When one group does condition A and a second group does condition B.
Participants should be randomly allocated to experimental groups

Question 2

What are positives of independent group design

Answer 2

No order effects-participants only tested once so no practice/boredom/fatigue effects
Will not guess aim-participants only tested once so won’t guess aims this will lead to more natural behaviour

Question 3

What are negatives of independent group designs

Answer 3

Participant variables-participants in groups are different acting as EV/CV
Less economical-twice as many participants so more time recruiting which is expensive

Question 4

What are repeated measures designs

Answer 4

When same participants take part in all conditions of the experiment.
The order of conditions should be counterbalanced to avoid order effects

Question 5

What are positives of repeated measures designs

Answer 5

Participant variables-person in both conditions has same characteristics
Fewer participants-less time recruiting so cheaper

Question 6

What are negatives of repeated measures designs

Answer 6

Order effects-may do worse or better when doing a similar task twice. Practice/boredom/fatigue effects
Participants guess aims-this may change their behaviour

Question 7

What is a matched pairs design

Answer 7

When two groups of participants are used but they are also related to each other by being paired on participant variables that matter for the experiment

Question 8

What are positives of matched pairs design

Answer 8

Participant variables-matched on a variable relevant to experiment
No order effects-participants tested once(no effects)

Question 9

What are negatives of matched pairs design

Answer 9

Matching is not perfect-time consuming and can’t control all variables
More participants-same as independent group and is time consuming and expensive