Repeated Measures:
A repeated measures design is where all the participants take part in all conditions of the experiment. For example, in the energy drink experiment;
- All participants would be tested with the energy drink
- All participants would be tested again later with water
The two sets of data would then be compared to see if there was a difference

Each participant has to do at least two tasks and the order of these may be significant
Order effects may arise because repeating two tasks could create boredom or fatigue that might cause deterioration in performance on the second task, so it matters what order the tasks are in. Alternatively participants performance may improve through the effects of practice, especially on a skill based task - in this case participants would perform better on the second task. Order acts as a confounding variable
It is very likely participants will work out the aim of the study so there may be more demand characteristics
Participant variables are controlled and fewer participants are needed

	Creado por Caitlyn Grayston hace más de 9 años

AS level (Research Methods) Psychology Apunte sobre Experimental Design, creado por Caitlyn Grayston el 21/05/2017.