Easy
ANOVA (One-Way and Two-Way)
SPSS
Free
A health psychologist runs a two-way ANOVA predicting stress score from Diet (Standard vs. Low-carb) and Exercise (Low vs. High). SPSS shows a significant Diet × Exercise interaction (Sig. = .030). What does this interaction mean?
A
Diet has an effect on stress, averaged across exercise levels
B
Exercise has an effect on stress, averaged across diet groups
C
The effect of diet on stress depends on the level of exercise (or vice versa)
D
Diet and exercise must be correlated, so ANOVA assumptions are violated