What is the research design called that involves manipulation of an independent variable without the random assignment of participants to conditions or order of conditions?

1. A

   Pre experimental

2. B

   Quasi experimental

3. C

   Descriptive

4. D

   Non experimental

Appeared in: AIIMS Raipur NO - 2019 (Shift-2)

Explanation

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• Quasi-experimental research involves the manipulation of an independent variable to observe its effect on a dependent variable.
• The key differentiator of this design is the lack of randomization when assigning participants to experimental and control groups.
• This design is often called a non-randomized controlled trial (non-RCT).
• It is frequently used in nursing research because it is more practical and feasible in clinical settings where random assignment is not possible.

Why Other Options Were Wrong

• Option A: Pre-experimental designs are even weaker than quasi-experimental designs. While they involve manipulation, they often lack a control or comparison group, which severely limits the ability to draw conclusions about causality.
• Option C: Descriptive research does not involve any manipulation of variables. Its purpose is to observe and describe a phenomenon as it naturally occurs.
• Option D: Non-experimental is a broad category that includes descriptive research. The defining feature is the complete absence of manipulation of the independent variable. The question explicitly states that the independent variable is manipulated.

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Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Types of quantitative research designs as background academic context rather than a clinical decision trigger.
• Nurses frequently encounter quasi-experimental studies when evaluating the effectiveness of new clinical protocols, educational interventions, or quality improvement projects on their units.
• Understanding this design helps nurses critically appraise evidence. While not as strong as a true experiment (RCT), a well-designed quasi-experimental study can still provide valuable evidence for practice changes.
• What if? If the researcher in the scenario could randomly assign participants (e.g., by flipping a coin for each patient to decide if they get the new intervention or standard care), the design would become a 'True Experimental' study, which provides stronger evidence of causality.

How to Approach the Question

• First, identify the key components in the question's definition. The two critical phrases are 'manipulation of an independent variable' and 'without the random assignment'.
• Next, recall the definitions of the major research designs based on these two components.
• Eliminate options that don't fit. 'Descriptive' and 'Non-experimental' designs are incorrect because they do not involve manipulation.
• Differentiate between the remaining options. Both 'Pre-experimental' and 'Quasi-experimental' designs involve manipulation without randomization.
• Recognize that 'Quasi-experimental' is the standard term for designs that are 'almost' experimental, having manipulation but lacking randomization. 'Pre-experimental' refers to very weak designs that often also lack a control group.

Concept Tested & Keywords

• Concept Tested: Types of quantitative research designs
• Stem keywords: research design, manipulation of an independent variable, without random assignment
• Lead-in keywords: What is
• Negative lead-in flag: false

Question ID

QXAYYxDM9HHSKlZDomDW3j

Copy ID

Reference Book

E6 NursingResearch Suresh Sharma 5e Part 1 p. 177-179

E6 NursingResearch Sukhpal Kaur pp. 203-205, 206-208