experimental design

Question 1

what are the three types of experimental design?

Answer 1

• repeated measures
• independent groups
• matched pairs

Question 2

what is repeated measures?

Answer 2

where all participants in an experiment will experience all conditions of an experiment

Question 3

what is independent groups?

Answer 3

when separate groups of participants experience different conditions of an experiment. 2 levels of IV and each group only experiences 1

Question 4

what is matched pairs?

Answer 4

participants are paired together on a variable relevant to the experiment. the pairs are then split until there are 2 groups

Question 5

what is a strength of repeated measures?

Answer 5

• removes bias
• no participant variables
• less expensive due to needing less participants

Question 6

what is a limitation of repeated measures?

Answer 6

• order effects
• takes longer
• risk of demand characteristics

Question 7

what is a strength of independent groups?

Answer 7

• no order effects
• less expensive
• takes less time
• no demand characteristics
• allows for randomisation

Question 8

what is a weakness of independent groups?

Answer 8

• participant variables
• bias
• increased chance of confounding variables
• more expensive

Question 9

what is a strength of matched pairs?

Answer 9

• limited order effects
• less demand characteristics
• less participant variables

Question 10

what is a limitation of matched pairs?

Answer 10

• can’t match people exactly
• less economic
• more time consuming

Question 11

what are order effects?

Answer 11

the order of the conditions having an effect on participants behaviour
- practice effect
- fatigue effect
- boredom effect

Question 12

how can you counter balance order effects?

Answer 12

half participants do condition A then B and the other half do B then A
(ABBA)