experimental designs 2 Flashcards
what is factorial design
interested in the effects of two or more independent variables; more efficient to manipulate these variables in one experiment than to run a separate experiment for each variable.
what can only happen in experiments with more than 1 IV
testing for interactions among variables.
what is a factor
an IV
What is the main effect of an IV
effect of the variable averaging over all levels of other variables in the experiment
what does an analysis of variance provide us
significance test for the main effect of each variable in the design.
what happens if the main effect is significant
can reject null hpoth
what is interaction
2 IVs interact if effect of one of the variables differs depending on the level of the other variable
why is factorial design beneficial in terms of validity
good ecological validity as more complex so more relevant to real world
good internal validity as better equipped for understanding complex causal relationships
what are 3 strengths of using factorial design
test multiple hypotheses are are manipulating multiple IVs
Interactive effects emerged are highly important to theoretical question asking
more complex design means can include all potential factors influencing results so cam avoid confounding
what 3 things can multiple factors manipulate
IVs btwn ppts
IVs within ppts
IVs btwn and within ppts
what can mixed factorial designs do
manipulate factors from btwn and within
