2 - experimental design Flashcards
list the three types of experimental design
independent groups, repeated measures and matched pairs
describe independent groups design
participants only perform in one conditions of the iv
how are order effects not being present a strength of independent groups
less likely to improve in performance due to repetition and familiarity and less likely to decrease in performance due to boredom or tiredness
how are participants being less likely
to guess the aims of the study a strength of independent groups
demands characteristics eliminated
how is no control over participants variables a weakness of independent groups
different abilities of participants in the various conditions can cause changes to the dv
how is participant amount a weakness of independent groups
you need more participants than other designs to gather the same amount of data
how do you solve uncontrolled participant variables in an independent groups design
random allocation, ensured that each participants has the same chance of being in one condition of the iv as another
describe repeated measures
the same participants take part in all conditions of the iv
how is eliminating participant variables a strength of repeated measures
different abilities of participants won’t make a difference across the conditions
how is fewer participants being needed a strength of repeated measures
so not as time consuming finding and using them
how are order effects a weakness of repeated measures
participants may perform better because of familiarity or perform worse because of boredom or tiredness
how do you solve order effects in repeated measures
counterbalancing, half of the participants do conditions in one order and the other half do it in the opposite order
describe matched pairs
pairs of participants are first matched on some variable that has been found to affect the dv, then one member of each pair does one condition and the other does another
how is no order effects a strength of matched pairs
not boredom or familiarity to change task performance
how are demand characteristics being less of a problem a strength of repeated measures
less likely to guess aims as only doing one condition