Have students propose a factorial experiment

Have students propose a factorial experiment (see Handout 12.1). Specify that they are to predict a significant interaction; interpret the interaction; graph the predicted results, and discuss several other possible patterns of results (a main effect, no interaction, a main effect and an interaction, two main effects and an interaction, etc.). Often, this factorial study will be an extension of a simple experiment or multivalent experiment that the student proposed earlier. If you want to give students a starting point for designing their study, you may want to consult

Lutsky, N. (1993). A scheme and variations for studies of social influence in an

experimental social psychology laboratory. Teaching of Psychology,

20, 105-107.

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