A true experimental study is a scientific investigation characterized by the following properties, except?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2018

Nursing Research & Statistics

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2018

Explanation

A cohort group is a key feature of an observational cohort study, not an experimental one.
In cohort studies, researchers observe a group (cohort) over time to see how exposure to certain factors affects outcomes, without actively intervening.
True experimental studies require active intervention (manipulation) by the researcher, which is fundamentally different from the observational nature of cohort studies.

Option A: Manipulation, which is the researcher's act of introducing an intervention or treatment, is a core and mandatory characteristic of a true experimental study.
Option B: The use of a control group to serve as a baseline for comparison is an essential element required to establish causality in a true experimental design.
Option D: Randomization, or the random assignment of participants to either the control or experimental group, is a hallmark of a true experiment. It is crucial for eliminating selection bias.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Characteristics of a true experimental study design as background academic context rather than a clinical decision trigger.
Nurses must be able to differentiate between study designs to critically appraise research. Understanding that Randomized Controlled Trials (true experiments) provide the highest level of evidence for causality is fundamental to Evidence-Based Practice (EBP).
This knowledge allows nurses to evaluate the strength of evidence behind a clinical guideline or intervention before implementing it in patient care.
What if? If a study has manipulation and a control group but lacks randomization, it is classified as a quasi-experimental design. This design is more prone to bias and provides weaker evidence for a cause-and-effect relationship than a true experiment.

How to Approach the Question

First, identify the negative framing of the question, indicated by the word 'except'. This means you are looking for the option that does not fit with the others.
Next, recall the definition and core characteristics of the key concept in the stem: 'true experimental study'.
The three defining properties of a true experiment are Manipulation, Control, and Randomization.
Systematically evaluate each option against this definition. 'Manipulation', 'Control', and 'Randomization' are all core properties and thus, incorrect answers for this 'except' question.
The option 'Cohort group' is associated with a different study type (observational cohort study), making it the correct exception.

Concept Tested & Keywords

Concept Tested: Characteristics of a true experimental study design
Stem keywords: true experimental study, scientific investigation, properties
Lead-in keywords: except
Negative lead-in flag: The question asks for the exception among the given options.

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