61. A researcher samples the population of registered voters in a city by selecting every 100th person on the list of registered voters. Which sampling plan is described?
Answer: C
Systematic sampling is the method described.
The researcher employs a systematic sampling method by selecting every 100th person on the list of registered voters. This approach ensures that the sample is spread evenly across the entire population.
A) Judgment
Judgment sampling, also known as purposive sampling, involves selecting individuals based on the researcher's knowledge and judgment about who would be most informative. This is not applicable in this scenario as the researcher is using a fixed interval rather than personal judgment to select participants.
B) Quota
Quota sampling involves segmenting the population into mutually exclusive subgroups and then non-randomly selecting participants from each subgroup to meet a predetermined quota. This method does not apply here, as the researcher is not aiming to fill quotas but rather systematically choosing individuals based on a specific interval.
C) Systematic
Systematic sampling is the correct method described, as it involves selecting members from a larger population at regular intervals. In this case, every 100th person is chosen, which exemplifies the systematic approach to sampling.
D) Convenience
Convenience sampling entails selecting individuals who are easiest to access, rather than using a structured approach. The method described does not fit this definition, as it relies on a systematic interval rather than simply choosing the most readily available individuals.
Conclusion
Systematic sampling is definitively the correct answer because it describes the practice of selecting participants at regular, predetermined intervals. Options A, B, and D fail to match the systematic method outlined in the question, further reinforcing that C is the only suitable choice in this context.