Suppose Thomas is studying the effects of stress and success on cooperation. He manipulates stress by creating a time-pressure situation (high stress) or a low time-pressure situation (low stress) for participants to take a quiz. He then manipulates success by giving participants false feedback on a quiz (failure or success). Participants then play a game and Thomas measures the extent to which they cooperate. Participants are exposed to only one combination of the two independent variables. What is this study’s design? How many graphs of simple effects will Thomas have? If Thomas finds no interaction effect, what would a graph of his simple main effects look like?
What will be an ideal response?
Ans: Varies.
Thomas is conducting a 2 x 2 multifactorial between-subjects design. Thomas has four conditions, so he would graph four simple main effects (one for each of the four conditions). If Thomas finds no interaction effect, graphing the simple main effects will produce parallel lines.
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