PSY Quiz 3 (pt. 2/2)

crossover interaction

the lines cross over on the graph

1. Doesn’t tell anything about the data, just about how the graph looks

spreading interaction

the lines look like “<” on the graph 

1. Doesn’t tell anything about the data, just about how the graph looks

factorial design

an experiment with 2 or more IVs

• Define your cells–combinations of IVs

• Studies manipulated variables or participant variables

participant variables

variable that is NOT manipulated but still considered an IV (e.g., age)

limit

can be tested with a factorial design; whether an IV effects different kinds of people or people in different situations the same way

1. Form of eternal validity

2. Influences the format graphs 

moderators

shown through interactions; when one IV has a different impact depending on the level of the second IV

interactions on graphs

1. Interaction = lines cross (or will eventually cross) on a graph

2. NO interaction = lines are parallel or right on top of each other

main effect

is there an overall difference when considering just one IV at a time?

• Averaging DOWN THE COLUMNS OF THE CHART/ACROSS THE ROWS OF A CHART

interaction

is there a difference in the differences? - considering one IV at different levels of another IV

1. No difference between differences = NO interaction; Difference between differences = interaction

2. Subtracting DOWN THE COLUMNS OF THE CHART/ACROSS THE ROWS OF A CHART

Factorial variations

1. independent-groups factorial designs/between-subjects factorial design

   1. 2x2 design = 4 groups

   2. 2x3x2 = 12 groups

2. Within-groups factorial design

3. Mixed factorial designs

4. Increasing the number of levels of an IV–may add more lines to graphs

5. Increasing the number of IVs–may need >1 graph

independent-groups factorial designs/between-subjects factorial design

IVs are studied as independent groups 

1. 2x2 design = 4 groups

2. 2x3x2 = 12 groups

Within-groups factorial design

participants experience all levels of the IVs within their groups

Mixed factorial designs

one IV is manipulated as independent-groups and the other IV is manipulated within groups

factorial notation

 ___x___x___