A company sell roofing products to home repair retailers. The owner is interested in studying the effects of several variables on the value of shingles sold. The marketing manager is arguing that the company should spend more money on advertising, while a market researcher suggests it should focus more on making its brand and product more distinct from the competitors. The company has divided the U.S. into 26 marketing districts. In each district, it collected information on the following variables: volume of sales (in thousands dollars), advertising dollars (in thousands), numbers of active accounts, number of competitor brands, and a rating potential.
a) Run a linear multiple regression
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