Factorial ANOVA: Two-way Independent ANOVA

Question 1

Two-way independent ANOVA

Answer 1

• When there are 2+ IVs
• Between-groups design
• Two-way ANOVA = 3 effects
  
  • 2 x main effects (one for each IV)
    
    • Whether there is an effect of alcohol on blood pressure
    • Whether there is an effect of exercise on blood pressure
  • 1 x interaction effect
    
    • Whether the effect of alcohol on blood pressure is affected by the amount of regular exercise people do

Question 2

Two-way independent ANOVA SPSS output

Answer 2

• 3 things to look at:
  
  • Significance of main effects (x2)
  • Significance of interaction
• Conduct follow-up test

Question 3

Interpreting interactions

Answer 3