Hospital Nurses Are Observed in Order to Determine Exactly How

Hospital nurses are observed in order to determine exactly how long nurses at a major urban hospital swab IV ports with alcohol. The researcher chooses to observe nurses in a high-acuity emergency department within that hospital. Because the nurses often are in near-code circumstances, they "scrub the hub" only as long as they have time to do so. Collecting data exclusively from this high-acuity unit is an example of what concept, relevant to quantitative research?

A) Causality
B) Control
C) Retrospective design
D) Bias

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