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Testing if promotion adds sales

You want to prove that paid promotion of your guides actually adds sign-ups rather than reaching people who would sign up anyway. Which design is best?

A.Promote everywhere and count sign-ups from people who saw an adB.Ask the ad platform's own report whether it workedC.Promote in some matched regions, hold out others, and compare the changeD.Compare this month with a random month two years ago

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Testing if promotion adds sales

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