experimental design

what are the 3 experiment designs

independent groups design

matched pairs design

repeated measures design

what is independent groups + weakness

when pps are randomly allocated to a condition A or B

:( introduces pps variables e.g. sleep quality - differences in DV may be due to particular characteristics

:( more pps required than repeated measures

how to deal with IG limitation

random allocation to conditions to eradicate researcher bias

does independent groups produce related or unrelated data

unrelated - data of an individual in one condition cannot be paired to the data of individual in the other condition as they are separate people

what is matched pairs + weakness

when different pps are matched on a characteristic they share e.g. gender

:( time consuming to match pps

:( more pps required than in repeated measures

how to deal with MP limitation

reduce nO of variables to match pps on so its simple and fast

does matched pairs produce related or unrelated data

related = pps score in one condition can be paired with their matched pps in other condition

what is repeated measures + weakness

when the same pps carry out both condition A and B

:( order effects, pps likely to get border or tired which lowers their performance

:( may figure out the aim of study

how to deal with RM limitation

counterbalancing - AB or BA

half pps carry out conditions in one order other half pps carry out conditions in opposite order

does repeated measures produce related or unrelated data

related = a pps score in one condition can be paired to their score in the other condition