A researcher who uses Point of Sale data from specific Walmart stores exemplifies what type of sampling method?

The selected answer is appropriate because the researcher is utilizing Point of Sale (POS) data from specific Walmart stores, which indicates that the samples are chosen based on their availability and accessibility rather than through a random selection process or a systematic methodology. This approach is characteristic of convenience sampling, where researchers select subjects or data points that are easiest to reach or most readily available.

In this case, the researcher is likely focusing on stores that they have access to, thereby gathering data that is convenient for their study. This method is often used in practice for its simplicity and speed, as it does not require extensive randomization or systematic procedures. The data collection method of selecting specific Walmart stores based on ease of access aligns well with the definition of convenience sampling.