A shoe store developed the following estimated regression equation relating sales to inventory investment and advertising expenditures.
y = 25 + 10x1 + 8x2
Where
x1 = inventory investment ($1,000s)
x1 = advertising expenditures ($1,000s)
y = sales ($1,000s)
a. Predict the sales resulting from a $15,000 investment in inventory and an advertising budget of $10,000.
b. Interpret b1 and b2 in this estimated regression equation.