The marketing research group of a corporation examined the public response to the introduction of a new TV game module by comparing weekly sales volumes (in $ thousand) for three different store chains in each of four geographic locations.

a. Write an appropriate model (including an effect for weeks) and the sources of variability in an analysis of variance table.
b. How would your model change if we analyze the total 2-week sales data?
c. Run an analysis of variance on the 2-week sales data using formulas from Chapter 15. Use α = .05.

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