2. [-/1 Points] DETAILS ASWSBE14 15.E.004.M|. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A shoe store developed the following estimated regression equation relating sales to inventory investment and advertising expenditures. )7: 21 + 10X1 + 7x2 where X1 = inventory investment ($1,0005) x2 = advertising expenditures ($1,0005) y = sales ($1,0005). (a) Predict the sales (in dollars) resulting from a $15,000 investment in inventory and an advertising budget of $11,000. $:l (b) Interpret b1 and b2 in this estimated regression equation. Sales can be expected to increase by $ for every dollar increase in inventory investment when advertising expenditure is held constant. Sales can be expected to increase by $ for every dollar increase in advertising expenditure when inventory investment is held constant