Chapter 11 - Factorial Designs Flashcards
What is the other name of factorial design studies?
two-factor designs
What makes a factorial design an experimental design?
Having variables that are manipulated and randomly assigned (ex: taking a drug)
What are quasi-independent variables in factorial designs?
Variables that are pre-existing, such as age or gender
How are called the IND v when there are more than 1?
Factors
How is called a study with 2 INDv?
Two-factor design
How is called a study with 3 INDv?
Three-factor design
How is called a study with 1 INDv?
Single-factor design
What are levels of INDv?
the different values that an independent variable can take (ex: 5 min, 10 min or 15 min = 3 levels of INDv time)
What is a 2x2x2 study called?
3 factors with 2 levels in each factor
What is the main advantage of factorial designs?
They are more representative of the interactions happening in real life
What are the 3 informations provided by factorial designs?
Actual data
Interactions
Main effects
How do we find a main effect?
Comparison of 2 column or row means
Same = no main effect
How do we find an interaction between factors?
Compare the differences between scores in the rows or columns (if same = no interactions)
How can we notice an interaction in a graph?
Two parallel lines = no interaction
Crossing lines = interaction
How is called an interaction shown with crossing lines in a graph?
A crossover interaction
