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    Analysis of Interaction Effect in the Model

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    First, explain in your own words (no direct quotes, please) what it means when there is an interaction between two factors. Secondly, describe in words the hypothesis that enables us to test for the interaction between two factors. Thirdly, describe the method for testing that hypothesis. Next, explain how we interpret the situation in which a factor interaction exists.

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    Solution Preview

    Suppose there are two factors involved in our model (note: some books call this 2X2 design).

    The interaction occurs when the effect of one factor is affected by the effect of another factor. If you draw the effects of both factors, then interaction happens when two lines of ...

    Solution Summary

    The solution discusses the interaction effects in the regression model.