Management proposed the Following regression model to predict sales at a Fastfood outlet. V=o+131x1 +32x2+33x3 + E where x = number of competitors within one mile population within one mile {1,000s} llel ll 1 if drive-up window present 0 otherwise y = sales ($1,0005}. The following estimated regression equation was developed after 20 outlets were surveyed. f = 10.1 4.2xl + 6.8)(2 + 15.1){3 {a} what is the expected amount of sales (in dollars) attributable to the drive-up window? 1;: (b) Predict sales (in dollars] for a store with three competitors within one mile, a population of 8,000 within one mile, and no driveup window. 1;: {c} Predict sales (in dollars] for a store with one competitor within one mile, a population of 3,000 within one mile, and a drive-up window. 1