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From Chapter 19 - Discussion Question #6, page 574: Sales of a product are influenced by the salesperson’s level of education and gender, as well as consumer income, ethnicity, and wealth.
a. Formulate this statement as a multiple regression model (form only, without parameter estimation).
b. Specify dummy variables.
c. If the effects of consumer income and wealth are not additive alone, and an interaction is expected, specify a new variable to test for the interaction.
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