What type of research design is exemplified by a nurse introducing a new technique for stress reduction to a group selected from a convenience sample?

The identification of the research design as quasi-experimental is rooted in the characteristics of the scenario described. Quasi-experimental research designs involve interventions similar to experimental designs, but they do not employ random assignment of participants to different conditions. In this case, the nurse introduces a new technique to a specific group selected from a convenience sample, which indicates that participants were not randomly assigned but rather chosen based on their availability or other non-random criteria.

This lack of random assignment is a hallmark of quasi-experimental designs, which allow researchers to observe the effects of an intervention while acknowledging that there may be other confounding variables influencing the outcomes. The focus on practical application in a real-world setting, such as a nursing context, further supports the designation as quasi-experimental, as it reflects a pragmatic approach to testing interventions that may be implemented in healthcare settings.

In contrast, the other types of research designs either do not involve intervention (like nonexperimental), focus on subjective experiences (like qualitative), or include random assignment to assess the cause-effect relationship more strictly (like experimental). Thus, the scenario clearly fits the criteria for a quasi-experimental design.