Question: A regression analysis between sales ( in $ 1 0 0 0 ) and advertising ( in $ ) resulted in the following sample regression

A regression analysis between sales (in $1000) and advertising (in $ ) resulted in the following sample regression equation: hat(y)=90,000+6x. This implies that
Multiple Choice
an increase of $5 in advertising is expected to increase sales by $6,000.
an increase of $1 in advertising is expected to increase sales by $90,006
an increase of $1 in advertising is expected to increase sales by $6,000
A regression analysis between sales (in $1000) and advertising (in $

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