Answer:
informal surveys
Step-by-step explanation:
From the question we are informed about A not-for-profit firm which uses a small convenience sample to gather data on customer reactions. It invites a small group of customers for lunch and asks them to share what they think about the products they have purchased from the firm. In this case, this is an example of informal surveys.
Informal surveys can be regarded as type of survey whereby there is conduction of interviews as well as making of field observations by researchers themselves, instead of
enumerators as regards formal survey.
distinguishing characteristics of formal survey is that direct nteraction will exist in between the farmer as well as the
interdisciplinary team of researchers.