Experimental design

Question 1

Repeated measures design

Answer 1

-Participants all take part in both the control and experimental conditions in the experiment.

Question 2

Independent groups design

Answer 2

-Pariticpants only take part in one condition only. Each condition has a different group of participants.

Question 3

Matched pairs design

Answer 3

-Participants are matched on important characteristics, e.g, IQ or age. Each member of the pair is then placed into separate conditions.

Question 4

Repeated measures design advantages and disadvantages

Answer 4

Advantages
-Participant variables are removed, increasing internal validity
-Requires fewer participants, increasing external validity
Disadvantages
-Order effects, lowers internal validity
-Demand characteristics, lowers internal validity

Question 5

Independent groups design advantages and disadvantages

Answer 5

Advantages
-No order effects, increases internal validity
-Less chance of demand characteristics increases internal validity
Disadvantages
-Participant variables lower interal validity
-Requires more participants

Question 6

Matched pairs design advantages and disadvantages

Answer 6

Advantages
-Controls participant variables, increasing internal validity
-No order effects, increasing internal validity
Disadvantages
-Can’t control all participant variables, lowering internal validity
-Time consuming