Write an interaction model relating the mean value of

Chapter 12, Problem 34E

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QUESTION:

Write an interaction model relating the mean value of y, E(y) to

a. two quantitative independent variables

b. three quantitative independent variables [Hint: Include all possible two-way cross-product terms.]

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QUESTION:

Write an interaction model relating the mean value of y, E(y) to

a. two quantitative independent variables

b. three quantitative independent variables [Hint: Include all possible two-way cross-product terms.]

ANSWER:

Step 1 of 2

a)  An interaction model relating E(y) to two quantitative independent variables is

                       

where  represents the change in E(y) for every 1-unit increase in ,

holding  ?xed  represents the change in E (y) for every l-unit

increase in , holding  fixed.

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