Experimental Desingn Flashcards
what are the 3 types of experimental design
independent groups design
matched pairs design
repeated measures design
define independent groups design
different participants are used in each condition of the experiment. they should be randomly allocated to avoid researcher bias
what type of data does independent groups design produce
unrelated data, the individual data points in one condition can the paired with data sets in another condition
define repeated measures design
the same participants take part in all conditions
what type of data does repeated measures design produce
evaluation of repeated measures design
define matched pairs design
different participants complete each condition. People are assessed and matched on important characteristic for the particular research then are randomly assigned to separate conditions
what type of data does matched pairs design produce
related data, each pp’s score in one condition can be paired with another score in another condition
define extraneous variables
different factors that could affect the DV but are not ones being tested
define confounding variables
undesired variables that influence the relationship between the independent and dependent variables
why must variables be operationalised
being clearly defined allows for manipulation of the independent variable and also means the dependent variable can be precisely measured
define participant variables
individual differences between participants that may affect the DV.
define situational variables
features of an environment that affect the DV
what are 2 ways to control participant variables
random allocation- removes potential bias and limit the influence of participant variables
matched pairs- revenant characteristics are measured before the study and the top 2 pp’s are randomly assigned to separate groups
