Populations, samples, and sampling methods

Published on January 31, 2023   8 min

Other Talks in the Series: Key Concepts - Academic Research Methodologies in Business

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Hello, my name is Dr. Christina Quinlan and I work at the Graduate Business School at the Technological University of Dublin. Today I'm going to talk to you about populations, samples and sampling methods.
The aim of this talk is to explain how to select a population and when and how to select a sample from a population for a research project, to explore the different ways of selecting a sample from a population.
The population of the study. The population of a study is all of the individuals relevant to the study. The population of the research project is also called the universe. As the term "the universe" implies, the population of a study is comprised of all of the units, items or individuals belonging to that population.
Samples and sampling in research. In social science research, it is often the case that the entire population of the research is too big and beyond the scope of the researcher. In such situations, the researcher clearly defines the population of the research and then selects, from that population, a sample to study. The proposed research is then carried out with the sample, instead of the entire population. Some research is carried out using entire populations, and some is carried out using samples, that is samples of populations.
The slide that I'm showing you now illustrates the population and the sample. The population is all of the X's. One X is one individual, one case or one element. All of the X's within the little egg illustrate the sample.