Final answer:
Jessica is part of a Customer Panel for ACNielsen, which uses ID cards to collect data on consumer purchases for market analysis.
Step-by-step explanation:
Jessica is a member of a group of consumers who engage in research for ACNielsen. In this scenario, where the members use ID cards that are scanned to gather purchase information, Jessica and her peers are part of a Customer Panel. This means that the information they provide is used by the company for market analysis. Customer panels are an essential tool in market research, providing valuable data that companies can analyze to understand purchasing behavior and patterns. These customer panels differ from focus groups, which involve a group discussion around a topic, and surveys, which typically consist of a series of questions given to a broad audience. Nielsen Ratings, known for their scientific approach to determining the popularity of television programming, also represent a systematic method of market research.