How does an experimental research design differ from a nonexperimental research design?
Non-experimental designs manipulate the dependent variable, and experimental designs manipulate the independent variable.
Experimental designs allow observation of a phenomenon as it naturally occurs, and non-experimental designs permit environmental manipulation.
Experimental designs are scientific, and non-experimental designs have no scientific basis.
Non-experimental designs attempt to test differences among variables, and experimental designs attempt to establish cause-and-effect relationships.
The Correct Answer is D
Choice A rationale
This statement is incorrect regarding the manipulation of variables in research design. In both experimental and some quasi-experimental designs, it is the independent variable that is manipulated by the researcher to observe its effect on the dependent variable. The dependent variable is the outcome being measured and is never manipulated. Non-experimental designs do not involve manipulation of any variables but rather focus on observing and describing relationships as they exist in nature.
Choice B rationale
While experimental designs do involve manipulation, the distinction provided here is slightly misleading. Experimental designs create a controlled environment to test interventions, whereas non-experimental designs observe phenomena without interference. However, the core difference lies in the level of control and the ability to establish causality. Non-experimental research is often used when manipulation is unethical or impossible, allowing researchers to study variables in their natural state without attempting to change or control them.
Choice C rationale
Both experimental and non-experimental designs are grounded in the scientific method and are essential to the advancement of nursing knowledge. Non-experimental designs, such as correlational or descriptive studies, provide the foundational data and observations necessary to develop hypotheses. They are rigorous and follow specific protocols for data collection and analysis. Labeling them as having no scientific basis is a fundamental misunderstanding of research methodology and the various ways evidence is gathered.
Choice D rationale
Experimental designs are specifically structured to establish cause-and-effect relationships through the use of control groups, randomization, and manipulation of the independent variable. This allows researchers to claim that a specific intervention caused a specific change. In contrast, non-experimental designs are used to describe, explore, or test differences and relationships between variables without implying that one causes the other. They identify associations and patterns which provide critical insights into clinical situations and patient populations.
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Correct Answer is A
Explanation
Choice A rationale
The introduction section of a research article sets the stage by identifying the problem, the significance of the study, and the specific objectives or purpose. It outlines what the researcher intends to accomplish and the specific tasks involved in addressing the knowledge gap. This section is designed to provide the reader with the necessary context and justification for why the study was conducted and what specific questions the researchers aimed to solve.
Choice B rationale
The data analysis section focuses on the mathematical or thematic methods used to process the information collected during the study. It describes the statistical tests or coding techniques applied to the raw data but does not typically house the primary study purpose. By the time a reader reaches the analysis section, the purpose should have already been established in the earlier parts of the paper to provide a framework for the statistics.
Choice C rationale
The findings or results section is dedicated to presenting the actual data and outcomes discovered during the research. It reports the facts and figures without interpretation or restating the initial purpose in detail. While the findings should directly relate back to the purpose, the formal statement of the research task and the underlying goals are located in the beginning to guide the reader's understanding of the subsequent results.
Choice D rationale
The data collection section describes the practical steps taken to gather information, such as the tools used, the setting, and the procedures followed by participants. It is a methodological description of the how rather than the why. While the collection methods must align with the purpose, the actual declaration of the research task and study objectives is traditionally found in the introductory text to establish the study's logical direction.
Correct Answer is D
Explanation
Choice A rationale
This question relates to the literature review and the background of the study rather than the sample selection process. Placing the report in context involves identifying gaps in current knowledge and justifying the need for the study. While important for the overall critique of the research's significance and relevance, it does not assess whether the specific individuals recruited for the study were the right ones to provide the necessary qualitative depth for the investigation.
Choice B rationale
These criteria are used to evaluate the overall rigor and trustworthiness of the qualitative findings rather than the sampling technique. Credibility refers to the truth of the findings, auditability involves the ability of another researcher to follow the logic, and fittingness relates to the applicability of the results. While the sample influences these factors, this question is too broad to specifically critique the methodology used to select the participants or informants in the study.
Choice C rationale
This question focuses on the adherence to a specific qualitative methodology, such as phenomenology or grounded theory. It assesses whether the researcher followed the prescribed steps of that tradition throughout the entire study. While sampling is a part of those processes, this question is aimed at the general procedural integrity of the study rather than the specific appropriateness and representativeness of the informants chosen to reflect the lived experience or phenomenon under study.
Choice D rationale
In qualitative research, the sample is not meant to be statistically representative but rather "information-rich.”. Critiquing the sample selection requires determining if the participants have first-hand experience with the phenomenon and can provide the depth of information required. This question directly addresses whether the researcher targeted the correct individuals who possess the knowledge or experience necessary to answer the research question. It evaluates the purposeful sampling strategy essential for high-quality qualitative inquiry and data.
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