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You are graphing an interaction between a quantitative independent variable (dosage of a medication) and a categorical variable (treatment group vs. control group). If you observe opposite effects across these conditions, how should you draw the two lines to visually represent a cross-over interaction?

Question: You are graphing an interaction between a quantitative independent variable (dosage of a medication) and a categorical variable (treatment group vs. control group). If you observe opposite effects across these conditions, how should you draw the two lines to visually represent a cross-over interaction?

Sample answer: To visually represent a cross-over interaction, you should draw the two plotted lines so that they literally intersect and cross over each other as the dosage increases.

Key points:

  • The two plotted lines must be drawn to intersect.
  • The lines must cross over each other.

Rubric: Full credit is awarded for correctly applying the visual definition of a cross-over interaction to the graphing procedure.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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