A regression analysis between sales (y in $1000) and advertising (x in $100) vielded the least squares line y = 80000 + 5.. This implies that an: o increase of $1 in advertising is expected to result in an increase of $50 in sales increase of $1 in advertising is expected to result in an increase of $80 005 in sales. increase $5 in advertising is expected to result in an increase of $5000 in sales. increase of $1 in advertising is expected to result in an increase of $5 in sales