Thesis Sampling Procedure

The non-probability model is a technique in which samples are gathered in a way that does not give all individuals in a population equal chances of being selected.While choosing a non-probability method could result in biased data or a limited ability to make general inferences based on the findings, there are also many situations in which choosing this kind of sampling technique is the best choice for the particular research question or the stage of research.A purposive or judgmental sample is one that is selected based on the knowledge of a population and the purpose of the study.For example, when sociologists at the University of San Francisco wanted to study the long-term emotional and psychological effects of choosing to terminate a pregnancy, they created a sample that exclusively included women who'd gotten abortions.

A recommendation from a friend or acquaintance that the researcher can be trusted works to grow the sample size.For example, if the population of study contained 2,000 students at a high school and the researcher wanted a sample of 100 students, the students would be put into list form and then every 20th student would be selected for inclusion in the sample.To ensure against any possible human bias in this method, the researcher should select the first individual at random.Ultimately, though, the sampling technique you choose should be the one that best allows you to respond to your particular research question.There are four kinds of probability sampling techniques.They might also need to know the percentage of men and women who fall under different age, race, or class brackets, among others.The researcher would then collect a sample that reflected those proportions.Four kinds of samples may be created with the non-probability model.Relying on available subjects is a risky model that requires a great deal of caution on the part of the researcher.For this reason, convenience samples are commonly used in the early or pilot stages of research, before a larger research project is launched.Though this method can be useful, the researcher will not be able to use the results from a convenience sample to generalize about a wider population.

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