Final answer:
You are participating in consumer panel research, which tracks shopping habits to measure advertising effectiveness and consumer behavior, and is a form of market research.
Step-by-step explanation:
The type of research you are participating in is known as consumer panel research, which falls under the category of market research. Such research tracks the shopping habits of consumers to measure the effectiveness of advertising campaigns and to understand consumer behavior. By giving your ID number at checkout, the research company can aggregate purchase data from various households to analyze patterns and preferences. This approach is used by companies to tailor their marketing strategies and to assess the impact of their promotions and advertisements on sales.
In this case, the company collects data on what products you purchase, how often, and potentially how your purchasing decisions are influenced by different variables such as advertising. This is an example of primary data collection in market research, where the information is gathered directly from the source - the consumer.