Here are the answers: (a) a => 0, b => 0 , c <= 0 (b) a = 175086, without any advertising the company's sales is expected to be $175,086 b = 0.855, is the slope parameter of Vanguard's own advertising. b > 0 means it has a positive effect on the sales. c = -0.284, is the slope parameter of the rivals advertising. c < 0 means it has a negative effet on the sales.
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This note was uploaded on 07/07/2011 for the course BUSINESS 350 taught by Professor Mitchell during the Fall '09 term at Troy.