Experimental Design Flashcards
What are the 2 different conditions in a basic experiment
Experimental condition
Control condition
What condition has to be taken
If the PPs will take part in both of these conditions or whether they will only participate in one
What are repeated measures
Every participant will take part in each condition
Example of repeated measures
If we were investigating the effect of organisation on memory , the PP would take part in both the organised and unorganised condition
What is independent groups design
The PPs takes part in one condition
This means that each experimental condition has a different set of PPs
What is an example of independent groups design
A set of PPs for the organised memory condition is compared to a set of PPs in the disorganised condition e.g zimbardo
What is matched pairs design
Participants are different in each condition
What is matched pairs design pt2
However PPs are matched as closely as possible on key variables ; age ,gender,personality
One person from each pair is randomly assigned to the different conditions in the study and results are compared
Example of matched pairs design
One assigned to the organised memory condition is different to the disorganised memory condition
What type of design is matched pair design perfect for
MZ twins (identical )
What are limitations of repeated measures
-Order effects PPs so they may do better in the second condition due to practice in the first
-PPs may guess the aims and therefore act differently in the second condition
What are limitations of independent groups
-cannot control PPs variables e.g condition A PPs may have higher IQ than those in condition B ,which may impact results rather than the change than the change in IV
-Requires lots of PPs
What are limitations of matched pairs design
-time consuming to match PPs
-nit possible to control all the variables and match them all, unless MZ twins are used and there are too few in the wold compared to the norm population
How can you overcome the limitations of repeated measures
Counterbalance PPs-half of the PPs do condition A followed by condition B . The other half complete condition B followed by condition A
How can you overcome the limitations of independent groups
Randomly allocate PPs to conditions so in theory PPs variables should be distributed evenly across conditions
