A regression model between sales (y in $1000), 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
a. increased by $1 (holding advertisement constant), sales are expected to increase by $3.
b. decreased by $1 (holding advertisement constant), sales are expected to decrease by $3.
c. increased by $1 (holding advertisement constant), sales are expected to increase by $4000.
d. increased by $1 (holding advertisement constant), sales are expected to decrease by $3000.
d
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Fill in the blank(s) with the appropriate word(s).
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