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In an advertising experiment using before-after design, 3000 customers are randomly assigned to 3 groups. All groups are exposed to the existing advertisement for round 1 of the experiment. In round 2, new advertisements are shown to groups 2 and 3, while group 1 continues to see the old ads.

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Alexander Graham Crackers is studying the impact of a social media campaign for their Smorgasbords product line. Without social media, their sales in May were 120,000 boxes. With social media, sales in June rose to 160,000 boxes. Historically, May represents 10% of their annual sales and June represents 12%.

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