Answer:
Ethnographic research
Explanation:
Ethnographic research is a research method that studies behaviour of people in their own environment. This method uses methods such as face to face observation and interviewing. The objective of this is to provide a detailed description of the needs of the customers so that the product can be designed accordingly.
Thus, when Hershey Chocolate observe shoppers who buy chocolates and other candies. After shoppers make their purchase, the researchers, standing at the end of the aisle, ask a few demographic and psychographic questions to better know who the buyers are. Then they give the shoppers some free chocolates for their time. This is an example of ethnographic research.