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Essay / Research Paper Abstract
An 8 page paper that begins with a statement explaining target population and sample population. The first part of the paper explains different non-probability designs, including purposive, convenience and volunteer. Probability designs are then discussed, including simple random designs, stratified, systematic, cluster and multi-stage with examples. Bibliography lists 4 sources.
Page Count:
8 pages (~225 words per page)
File: MM12_PGprbnpb.rtf
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Unformatted sample text from the term paper:
in the study (University of Victoria, 2006). It is usually not feasible to collect information from the entire population, which is why a sample is used. If the sample is
representative of the entire target population, inferences can be drawn about the entire population (University of Victoria, 2006). How reliable those inferences are depends on how well the sample data
are collected (University of Victoria, 2006). The difference between probability sampling and non-probability sampling is that probability sampling involves random selection (Trochim,, 2005a). In effect, the researcher selects the persons
that will be included in the study (University of Victoria, 2006). Thus, because this method is subjective, non-probability samples may or may not represent the population (Trochim,, 2005a). With probability
sampling, we know the odds of the results representing the population (Trochim,, 2005a). The sample is selected in an objective fashion, without bias (University of Victoria, 2006). There are three
broad types of non-probability sampling - purposive, convenience and volunteer (University of Victoria, 2006). Most sampling methods are purposive because the researcher generally has some sort of plan (Trochim,, 2005a).
Volunteer and convenience sampling are also called accidental sampling by some people (Trochim,, 2005a). An example of convenience sampling is the man on the street type of survey where the
investigators is asking the opinions of anyone on the street (Trochim,, 2005a). Convenience sampling is including persons in the study because they are accessible, thus, convenient (University of Victoria, 2006).
Many psychological studies are conducted on college campuses and ask for volunteers to participate (Trochim,, 2005a; University of Victoria, 2006). Since the sample is self-selected, volunteers may not be reflective
of the general population (Trochim,, 2005a; University of Victoria, 2006). With purposive sampling, the researcher typically has a predefined group of participants in mind (Trochim,, 2005a). For example, an interviewer
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