... into 2 piles dependant on colour quicker than they will be able to complete the more complex task of diving them into 2 piles dependant on whether the number is odd or even. Method Design There are different ways of organising experiments to try to control extraneous variables. We decided to use the repeated measures design. This meant that one group of participants were tested two (or more) times under each condition of the independent variable. This is an advantage as it controls individual differences in ability and motivation as examples of extraneous variables. This repeated measures method however doesn't take into account that participants may perform worse the second time they complete each task due to tiredness or boredom. These are the order effects. On the other hand participants may perform better the second time due to the effects of practice. There are ways to help control these order effects that I ...

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