Which of the following is an example of probability sampling

KPSC Staff Nurse - 2021

Nursing Research & Statistics

Easy

Appeared in: KPSC Staff Nurse - 2021

Explanation

Systematic sampling is a form of probability sampling.
It involves selecting elements from an ordered sampling frame at a regular interval (the k-th element).
The process starts with a randomly selected element, which ensures that each element has a specifiable, non-zero probability of being included in the sample.
This method is considered more precise than simple random sampling when there is a pattern in the population list, and it is often easier to implement.

Option A: Purposive sampling is a non-probability method because the researcher uses their own judgment to select participants based on specific characteristics, rather than using random selection.
Option B: Quota sampling is a non-probability method. Although it ensures the sample has the same proportions as the population for certain traits, the actual selection of individuals within each quota is non-random and often based on convenience.
Option D: Convenience sampling is a non-probability method because it involves selecting participants who are most easily accessible to the researcher. There is no random selection, leading to a high risk of a biased and unrepresentative sample.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Distinguishing between probability and non-probability sampling methods in research as background academic context rather than a clinical decision trigger.
Understanding sampling methods is fundamental for evidence-based nursing practice. It allows nurses to critically appraise research studies and determine the credibility and generalizability of their findings.
A study using probability sampling provides stronger evidence for making clinical decisions or changing practice compared to one using non-probability sampling.
What if a study on the effectiveness of a new patient education technique used a convenience sample of highly motivated patients? A nurse should be cautious in assuming the same positive results would occur in the general patient population, which includes less motivated individuals. The sampling method limits the generalizability of the findings.

How to Approach the Question

First, identify the key concept in the question, which is 'probability sampling'.
Recall the definition of probability sampling: a method where every individual in the population has a known, non-zero chance of being selected, typically involving a random process.
Evaluate each option against this definition.
Analyze 'Purposive', 'Quota', and 'Convenient' sampling. Recognize that these methods rely on the researcher's judgment, specific criteria, or ease of access, not on random chance. Therefore, they are non-probability methods.
Analyze 'Systematic' sampling. Recall that it involves a random start and a fixed interval, which fits the criteria for a probability sampling method.
Conclude that Systematic sampling is the correct example of probability sampling among the choices.

Concept Tested & Keywords

Concept Tested: Distinguishing between probability and non-probability sampling methods in research.
Stem keywords: probability sampling, example
Lead-in keywords: Which of the following
Negative lead-in flag: false

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