Final answer:
Opinion sampling is a market research technique that can provide worthless information on consumer buying patterns and preferences because it may not be based on comprehensive research methods.
Step-by-step explanation:
Market research that provides worthless information on consumer buying patterns and preferences is typically referred to as opinion sampling. Opinion sampling involves gathering data through surveys or polls, which may not be based on comprehensive research methods and therefore may not produce reliable or useful information.
Opinion sampling involves gathering a representative sample of opinions or preferences from a target population. If the statement implies skepticism about the usefulness of such information, opinion sampling may be a relevant term. However, it's worth noting that market research, when conducted properly, can provide valuable insights into consumer behavior and preferences.