Outline three features of a laboratory experiment. [3 marks] Matt is carrying out psychological research into memory. He goes to the canteen in his school and asks the first 20 people he meets to be participants in his study.

What is the sampling method used in Matt's study?[1 mark]

What would be a fairer sampling method that Matt might have used?

Matt decides to test the memory of males and females in his research.[1 mark]