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In the model Y = 30,000 + 4 X, Y is sales in $1000 and X is advertising expenditures in dollar. The above equation implies

In the model Y = 30,000 + 4 X, Y is sales in $1000 and X is advertising expenditures in dollar. The above equation implies that an

A. increase of $4 in advertising is associated with an increase of $4,000 in sales

B. increase of $1 in advertising is associated with an increase of $4 in sales

C. increase of $1 in advertising is associated with an increase of $34,000 in sales

D. increase of $1 in advertising is associated with an increase of $4,000 in sales

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