Advertising and salesA company doubled its online advertising budget, and the following quarter, sales increased by 15%. The marketing director concludes that the increased ad spend caused the sales increase.Which of the following, if true, most weakens this conclusion?

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Advertising and sales<br>A company doubled its online advertising budget, and the following quarter, sales increased by 15%. The marketing director concludes that the increased ad spend caused the sales increase.<br>Which of the following, if true, most weakens this conclusion?





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