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CHAPTER 2

Two Factor Analysis

2.1 Two-Way Analysis of Variance

Many response variables are affected by more than one factor. Because of this we must often conduct experiments in which we study the effects of several factors on the response. In this section we consider studying the effects of two factors on a response variable.

Example 2.1

The Tastee Bakery Company supplies a bakery product to many metropolitan supermarkets. The company wishes to study the effects of two factors—shelf display height and shelf display widthon monthly demand (measured in cases of 10 units each) for this product. The factor “display height” is defined to have three levels: (bottom), (middle), and (top). The factor “display width” is defined to have two levels: ...

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