Which of the following terms refers to households identified for a study by a unique bar-coded card?

The term that refers to households identified for a study by a unique bar-coded card is a scanner-based panel. This method involves using bar-coded cards that allow researchers to track purchasing habits and behaviors of specific households over time. By scanning their purchases with the bar-coded card at retail locations, researchers can collect detailed data on consumer behavior, preferences, and trends without relying on self-reported data.

Scanner-based panels provide valuable insights for marketers and researchers, as they facilitate the analysis of real-time purchasing behavior across various segments of the market. This data can then be used to inform marketing strategies, product placement, and advertising efforts. The unique identification of households helps ensure accurate data collection and accountability, making it a powerful tool in marketing research.

In contrast, focus groups involve a small group of individuals discussing a product or service, and do not rely on bar-coded identification. Control groups and experimental groups are terms used primarily in experimental research where one group is exposed to a treatment (experimental) and the other is not (control), but again, these do not specifically involve bar-coded tracking of purchases.