Great Plains Roofing and Siding Company Inc. sells roofing andsiding products to home repair retailers such as Lowes and HomeDepot and commercial contractors. The owner is interested instudying the effects of several variables on the value of shinglessold ($000). The marketing manager is arguing that the companyshould spend more money on advertising while a market researchersuggests it should focus more on making its brand and product moredistinct from its competitors. The company has divided the UnitedStates into 26 marketing districts. In each district it collectedinformation on the following variables: volume of sales (inthousands of dollars) advertising dollars (in thousands) numberof active accounts number of competing brands and a rating ofdistrict potential.