Experimental designs

Question 1

Experimental designs

Answer 1

1. Independent groups – 2 separate groups involved, each group does the conditions once
2. Repeated measures – All p’s take part in all conditions
3. Matched Pairs design – P’s are matched on some variable related to the experiment and put into pairs, one of each pair is allocated to different conditions

Question 2

ADV and DIS of Independent groups

Answer 2

• Less demand characteristics ( p’s try to make sense of the research and act accordingly to support the aim of the research)
• High levels of individual differences = less internal validity that IV is causing DV.

Question 3

ADV and DIS of Repeated measures

Answer 3

• Less time consuming to obtain P’s , only one group needed
• Order effects – boredom, fatigue ( unless controlled using counterbalancing - one half completing the two conditions in one order and the other half completing the conditions in the reverse order)

Question 4

ADV and DIS of matched pairs

Answer 4

• No order effects – p’s take part in one condition only
• Difficult to match p’s so reduces internal validity