A regression analysis between sales (y in $1000) and advertising (x in dollars) resulted in the following equation:
= 59,000 + 11 x
The above equation implies that an increase of _____.
a. $1 in advertising is associated with an increase of $11 in sales
b. $11 in advertising is associated with an increase of $11,000 in sales
c. $1 in advertising is associated with an increase of $70,000 in sales
d. $1 in advertising is associated with an increase of $11,000 in sales