A supermarket offers in-store coupons for a brand of tuna fish in half of its stores; the other half do not feature any promotion. On the basis of a study, the supermarket concluded that "in-store coupons increased sales at least 10 percent in every matched grouping; in some instances, the increase was as high as 30 percent." What technique was used?

Question

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An experiment was conducted because the supermarket manipulated a variable (offering in-store coupons) and observed the effect on sales, comparing the results between stores with and without the promotion.

A Supermarket Offers In-Store Coupons for a Brand of Tuna