The evidence to assert, whether or not, experimental treatment/condition has made the difference refers to?

GMCH Chandigarh - 2019

Nursing Research & Statistics

Easy

Appeared in: GMCH Chandigarh - 2019

Explanation

Internal validity specifically addresses whether an intervention (the independent variable) truly caused the observed outcome (the dependent variable).
The question's phrase 'made the difference' is a direct reference to establishing a cause-and-effect relationship, which is the central focus of internal validity.
High internal validity means that alternative explanations for the findings (confounding variables) have been effectively ruled out, strengthening the evidence that the treatment worked.
As per research principles, if an experiment can clearly establish that the treatment caused an effect, it is said to have high internal validity.

Option A: External validity is about the generalizability of study results to other populations, settings, or times, not about the cause-and-effect relationship within the study itself.
Option C: Criterion validity is a measure of how well a particular test or measurement tool correlates with a known standard or outcome (the criterion). It is a concept related to measurement, not experimental causality.
Option D: Construct validity refers to how well a test or tool measures the abstract, theoretical concept it is supposed to measure (e.g., does a survey truly measure 'quality of life'?). It deals with the validity of the measurement, not the causal effect of the intervention.

Clinical Relevance

Nursing practice connection: Knowing Types of Validity in Research Methodology helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Understanding internal validity is crucial for Evidence-Based Practice (EBP). Nurses must be able to critically appraise research to determine if an intervention is genuinely effective before implementing it.
A study with low internal validity provides weak evidence, meaning a positive outcome could be due to chance or confounding factors, not the intervention itself. Adopting such an intervention could be ineffective or even harmful.
What if? A study reports that a new patient education program significantly reduces hospital readmissions. However, the study lacks a control group (low internal validity). A nurse should be cautious, as the reduction could be due to other factors (like a new hospital discharge policy) and not the education program. The nurse should seek higher-quality evidence from a randomized controlled trial (RCT) which has high internal validity.

How to Approach the Question

First, identify the core question. The phrase 'experimental treatment/condition has made the difference' points directly to the concept of cause and effect.
Next, analyze the keywords. 'Experimental treatment' implies an intervention is being tested, and 'made the difference' implies a resulting change.
Evaluate each option against this core concept of causality within a study.
Recall the definitions: 'Internal' validity is about the integrity inside the study (cause-effect). 'External' validity is about generalizing outside the study.
Recognize that 'Criterion' and 'Construct' validity are about the quality of measurement tools, not the experimental design's causal strength.
Conclude that 'Internal validity' is the only term that specifically describes the confidence that the treatment caused the outcome.

Concept Tested & Keywords

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