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A researcher decides to look at every fourth patient admitted each day and record if the IV is properly labeled, starting with a randomly selected patient. This is known as which of the following types of random selection?
Correct Answer: C
Detailed Explanation: Systematic sampling involves selecting every nth individual from a list or sequence after a random start. Option C: Systematic By choosing every fourth patient after a random start, the researcher is using systematic sampling. Option A: Simple Simple random sampling would involve selecting individuals at random, without a set interval. Options B and D: Convenience sampling is based on ease of access, and stratified sampling divides the population into subgroups before random selection. References: Systematic sampling is well-described in research methods literature, where interval selection following a random start is a key feature.