What method might be used to select every tenth customer from a list of complaints?

The method selected is systematic sampling, which is a technique used to select a sample from a larger population at regular intervals. In the scenario described, selecting every tenth customer means that you are creating a systematic approach to the selection process. This method involves starting with a random starting point and then selecting every nth individual (in this case, every 10th customer) from the list, which ensures that each member of the population has a chance of being included in the sample at equal intervals.

Systematic sampling is particularly effective when dealing with a large list, as it allows for a structured way to ensure the sample is spread out evenly across the population. Other sampling methods might not provide the same interval-based selection that systematic sampling does, making it a preferred choice for this specific situation.