09+Sampling

09+Sampling - SAMPLING Ron Sandwina, Ph.D. Communication...

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SAMPLING Ron Sandwina, Ph.D. Communication Studies Department IUPUI
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Sampling Defined n The process of selecting units (typically people) from some population to meet criteria specified by the researcher.
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Two Types of Sampling n Nonprobability q People in the population are not randomly selected. The sample does not reflect the entire population. n Probability q A method for selecting a sample that will be representative of the population from which it is selected. q People are randomly selected
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Types of Nonprobability Sampling n Convenience Sampling: people are selected based on their convenience. n Quota Sampling: q Certain groups are represented by using quota system. n Snowball Sampling: q The researcher asks participants to introduce the researcher to other participants, and so on. n Volunteer Sample: Typically used in universities.
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Uses for Nonprobability Sampling n Useful for examining stigmatized groups. n Useful when participants are difficult to obtain. n Useful for pilot surveys. q Working all the bugs out.
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n Key terms and characteristics of probability sampling q Random Selection: all members of the population have an equal chance of being selected. q Elements: the unit of analysis aggregation of elements. q Population: the specified aggregation of elements. q
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09+Sampling - SAMPLING Ron Sandwina, Ph.D. Communication...

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