Chapter 11 Flashcards
What is the purpose of a factorial design?
- Save time by studying more than 1 factor per experiment
- rule out more than 1 hypothesis
- Allows study of possible interactions between IVs.
What is a factorial design?
Any study with more than one IV.
What is a main effect?
The effect of one independent variable averaged over all levels of another independent variable.
Within subjects -Factorial design
Each subject experiences all conditions, and sequence and order effects are controlled for with counterbalancing.
Between subjects - factorial design
Subjects are only used once, separated into groups.
must control for selection bias –> use random assignment.
What is a confounded variable?
factors other than the independent variable that may cause a result.
What is a Mixed factorial design?
Research design that has both a between subjects variable and a within subjects variable
What is a subject variable?
Something that cannot be manipulated. EX. age. Can be chosen, but not manipulated.
What is an Interaction?
When the effect of one IV depends on the level of another IV.
