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15. value: 6.76 points Problem 3-30 Mark Price, the new productions manager for Speakers and Company, needs to find out which variable most affects the demand for their line of stereo speakers. He is uncertain whether the unit price of the product or the effects of increased marketing are the main drivers in sales and wants to use regression analysis to figure out which factor drives more demand for its particular market. Pertinent information was collected by an extensive marketing project that lasted over the past 12 years and was reduced to the data that follow: YEAR 1 2 3 4 5 6 7 8 9 10 11 12 UNIT SALES (THOUSANDS) 400 700 900 1,300 1,150 1,200 900 1,100 980 1,234 925 800 PRICE $/UNIT 280 215 211 210 215 200 225 207 220 211 227 245 ADVERTISING ($000) 600 835 1,100 1,400 1,200 1,300 900 1,100 700 900 700 690 a. Perform a regression analysis based on these data using Excel. (Negative values should be indicated by a minus sign. Round your answers to 4 decimal places.) y = Price + Advertising c. Predict average yearly speaker sales for Speakers and Company based on the regression results if the price was $300 per unit and the amount spent on advertising (in thousands) was $900. (Enter your answer in thousands. Do not round intermediate calculations. Round your answer to 2 decimal places.) Forecasted sales thousand units