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To best evaluate whether a new advertising campaign actually increased sales, it would be most useful to know:

Ahow much the campaign cost
Bwhich agency made the ads
Chow long the ads ran
Dwhat the sales were in the same period during previous years
Answer & Solution
Correct answer: D. what the sales were in the same period during previous years
Prior-year sales in the same period give a baseline to judge whether the campaign actually lifted sales.
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