Interaction (6 of 8)

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interaction plot
  1. Overall, Condition B2 led to better performance than did either B1 or B3. This effect was much more pronounced for subjects performing Task 1 than for subjects performing Task 2.

  2. The difference between Tasks 1 and 2 was greatest for subjects in Condition B2.

  3. The combination of Task 1 and Condition B2 led to especially high performance.

parallel lines: no interaction
In Example 4 there is no interaction. The effect of task is the same at all three levels of B and the effect of B is the same for both tasks. Notice that the two lines are parallel. When there is no interaction, the lines will always be parallel.
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