The scale used for measuring religion, type of disease and blood groups is?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2016

Nursing Research & Statistics

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2016

Explanation

The Nominal scale is used for variables that are categorical and can be placed into distinct groups without any inherent order or ranking.
Variables such as religion, type of disease, and blood groups are examples of nominal data because they are labels for categories (e.g., 'Hindu', 'Diabetes', 'Blood Group A').
The numbers that might be assigned to these categories (e.g., 1=Male, 2=Female) are for coding purposes only and have no mathematical value.

Option B: The Ordinal scale is incorrect because it requires the categories to have a meaningful order or rank. The variables listed (religion, disease type, blood group) do not have a natural ranking.
Option C: The Interval scale is incorrect because it applies to numerical data where the intervals between values are equal and meaningful, but there is no true zero. The variables in the question are categorical, not numerical.
Option D: The Ratio scale is incorrect because it is the highest level of measurement, requiring numerical data with equal intervals and a true zero point. The variables are non-numeric categories.

Clinical Relevance

Nursing practice connection: Knowing Scales of Measurement in Biostatistics helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
In nursing research, correctly identifying the scale of measurement is the first step in choosing the appropriate statistical test to analyze data and draw valid conclusions.
For example, when studying the association between marital status (Nominal) and the incidence of a certain disease (Nominal), a nurse researcher would use a Chi-square test, not a t-test.
Understanding scales helps in proper data presentation. A pie chart is suitable for showing the proportion of different blood types (Nominal) in a patient population, while a histogram would be used for blood pressure readings (Ratio).

How to Approach the Question

First, identify the type of variables mentioned in the question: religion, type of disease, and blood groups.
Analyze the nature of these variables. Ask yourself: Are these numbers or labels? Can they be put in a meaningful order?
Recognize that these are all labels for categories (e.g., 'Hindu', 'Diabetes', 'Type A'). There is no inherent ranking (e.g., 'Type A' is not 'better' or 'higher' than 'Type B').
Recall the definitions of the four scales of measurement: Nominal (categories), Ordinal (ordered categories), Interval (equal intervals, no true zero), and Ratio (equal intervals, true zero).
Conclude that the scale for non-ordered categories is the Nominal scale.
Select the option that matches this conclusion.

Concept Tested & Keywords

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E6 NursingResearch Sukhpal Kaur pp. 331-333, 419-421, 330-332