2 x 2 Factorial Design: OUTCOME 4

  • Factor A Main Effect: YES
  • Factor B Main Effect: YES
  • Factor A x Factor B Interaction: NO
  FACTOR B  
  B1 B2 Row Mean
FACTOR A A1
5 1
9 5
 3
A2 7
  Column Mean 7 3

General Interpretation

  • Factor A has an effect on the dependent variable (DV) when averaged over both levels of Factor B (different row means in table; non-flat, dashed red line in left graph).

  • Factor B has an effect on the dependent variable (DV) when averaged over both levels of Factor A (different column means in table; non-flat, dashed blue line in right graph).

  • The effect of Factor A does not depend on the level of Factor B; its effect is similar at both B1 and B2 (left graph). And, the effect of Factor B does not depend on the level of Factor A; its effect is similar at both A1 and A2 (right graph).