Information Resources, Inc. offers a service called BehaviorScan that provides marketers with data about advertising effectiveness by tracking consumer purchases tied to specific advertising. This is an example of which technique that can be used to measure sales impact?

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BehaviorScan is an example of experimental design, which involves manipulating variables (in this case, advertising) and measuring its impact on consumer behavior (in this case, purchase behavior). Other options like laboratory tests, consumer-feedback method, and historical approach don't involve manipulating variables or measuring impact in a controlled way, while share of advertising expenditures only looks at how much is being spent on advertising rather than its effectiveness.