Question at position 18 Professor Youlim wants to study eating habits among night-shift workers. To recruit participants, the researcher asks current participants to recommend coworkers who also work night shifts. This approach is an example of:Self-selection samplingStratified samplingConvenience samplingSnowball sampling

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The question presents a recruitment scenario where current participants are asked to recommend coworkers who also work night shifts. 
Option 1: Self-selection sampling. This would involve individuals volunteering themselves to participate, without being asked to recruit others. Here, participants are actively asked to refer peers, so this is not self-selection.
Option 2: Stratified sampling. This method involves dividing the population into distinct subgroups (strata) and sampling from each, usually with a predefined scheme. The scenario does not describe creating strata or proportional sampling from them, so this is not stratified sampling.
Option 3: Convenience sampling. This would rely on selecting participants who are easiest to reach or available, such as coworkers who are readily accessible. While the method uses participants' networks, the key feature here is the referral chain, not simply choosing convenient individuals, so this option doesn't neatly describe the process.
Option 4: Snowball sampling. This technique involves current participants referring or naming other potential participants, creating a chain-referral pool. Since the researcher asks existing participants to recruit their coworkers, this matches the snowball sampling pattern exactly.

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