2-1 sample design. sample subset of a larger population population any complete group people sales...
TRANSCRIPT
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2-1
Sample Sample DesignDesign
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SampleSubset of a larger population
PopulationAny complete group
PeopleSales peopleStoresStudentsTeachers
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CensusInvestigation of all individual elements that
make up a population
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Sampling FrameA list of elements from which the sample may
be drawn
Such asMailing lists Commercial directoriesTelephone directoryDatabases
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Categories of Sampling
Probability samplingKnown chances Every member gets a chance
Nonprobability samplingUnknown Probability of selecting any
particular member
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Nonprobability SamplingConvenienceJudgmentQuotaSnowball
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Convenience Sampling Obtaining the people who are most
conveniently (readily) available
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Judgment (purposive) Sampling An experienced individual selects the sample
based on his/her judgment about some characteristics required of the sample member
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Quota Sampling Various subgroups in a population are
represented on relevant sample characteristics according to researchers desire
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Snowball Sampling Initial members are selectedAdditional members are selected based on
information provided by the initial participants
1
1
2 3
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Probability SamplingSimple random sampleSystematic sampleStratified sampleCluster sampleMultistage area sample
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Simple Random Sampling Every member of the population has an equal
chance of being selected in the sample.
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Simple random sampling
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Systematic Sampling A simple processEvery nth name from the list will be drawn
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Systematic sampling
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Stratified SamplingSubsamples are drawn within different strataEach stratum is more or less equal on some
characteristic
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What is the right stratified sample?
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Cluster SamplingDividing the population into groups, or
clusters,Selecting some of these clusters at
random. Obtaining the sample by choosing all the
members within each of the selected clusters.
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Section 4
Section 5
Section 3
Section 2Section 1
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Population Element Possible Clusters
Airline travelers Airports travelers Planes travelers
Sports fans Football fans Basketball fans Car race fans
Karate fans