SAS Statistical Business Analyst Practice Questions - SAS Certified Specialist Statistical Business Analyst Using SAS 9 (A00-240) Exam

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A two-way ANOVA in PROC GLM shows a significant interaction term between TREATMENT and REGION. How should the main effects be interpreted?

The main effects are still the primary focus and the interaction is ignored. Main effects should be interpreted within levels of the interacting variable using LSMEANS / SLICE. Drop the interaction term to simplify interpretation. Interaction implies multicollinearity and the model must be refit.

Correct Answer:

Main effects should be interpreted within levels of the interacting variable using LSMEANS / SLICE.

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