experimental design Flashcards
describe independent groups design
ppts preform in only 1 condition of the IV
give strengths of independent groups design
- no order effects
- no demand characteristics
give limitations of independent groups design
- no control over ppt variables ( different abilities of ppts in various conditions affect DV)
- need more ppts to gather same amount of data
what is a solution to a limitation of independent groups design?
random allocation
- ensures each ppt has the same chance of being in 1 condition of the IV as another
describe repeated measures design
same ppts takes part in all conditions of the IV
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give strengths of repeated measures design
- eliminates ppt variables
- fewer ppts needed , not as time consuming
give a limitation of repeated measures design
-order effects present eg. boredom
what is a solution to a limitation of repeated measures design?
counterbalancing
- half the ppts do connditions in 1 order then other half do it in opposite order
describe matched pairs design
pairs of ppts first matched on a varibale that affects the DV
then 1 member of each pair does 1 condition and the other does another
give strengths of a matched pairs design
- no order effects
- less demand characteristics
give limitations of a matched pairs design
- time consuming + expensive to match ppts
- large pool of potential ppts needed
- difficult to know what variables are appropriate for the ppts to be matched