Question 42 A regression model between sales (y in $1,000), unit price (x1 in dollars) and television advertisement (x2 in dollars) resulted in the following function: y = 7 - 3x1 +5x2 For this model SSR = 3500, SSE = 1500, and the sample size is 18. The coefficient of the unit price indicates that if the unit price is increased by $1 (holding advertising constant), sales are expected to increase by $3 decreased by $1 (holding advertising constant), sales are expected to decrease by 53 increased by $1 (holding advertising constant), sales are expected to increase by $4,000 increased by $1 (holding advertising constant), sales are expected to decrease by $3,000