Week 5 Factorial Designs

Question 1

When does an interaction occur?

Answer 1

IV differs depending on level of second IV

Question 2

What are the advantages of using a factorial design?

Answer 2

• more than one IV can be manipulated (more hypotheses)
• can eliminate extraneous variables
• provide info on extraneous variable effect on DV
• interactive effects

Question 3

What are the disadvantages of using a factorial design?

Answer 3

• Requires more subjects
• more difficult to simultaneously manipulate combinations of IVs
• higher-order interactions difficult to interpret

Question 4

What info can you get from factorial designs?

Answer 4

simple effects
interaction effects
main effects

Question 5

What is the difference between main and simple effects?

Answer 5

Main effects averages factor b and simple effects holds factor b levels constant across factor A