Business Research Methods William G. Zikmund
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Transcript Business Research Methods William G. Zikmund
Sample Design
2-1
Sample
Subset of a larger population
Population
Any complete group
People
Sales people
Stores
Students
Teachers
Census
Investigation of all individual elements that make up a
population
Sampling Frame
A list of elements from which the sample may be drawn
Such as
Mailing lists
Commercial directories
Telephone directory
Databases
Categories of Sampling
Probability sampling
Known chances
Every member gets a chance
Nonprobability sampling
Unknown Probability of selecting any
particular member
Nonprobability Sampling
Convenience
Judgment
Quota
Snowball
Convenience Sampling
Obtaining the people who are most conveniently
(readily) available
Judgment (purposive) Sampling
An experienced individual selects the sample based on
his/her judgment about some characteristics required
of the sample member
Quota Sampling
Various subgroups in a population are represented on
relevant sample characteristics according to
researchers desire
Snowball Sampling
Initial members are selected
Additional members are selected based on
information provided by the initial participants
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1
3
Probability Sampling
Simple random sample
Systematic sample
Stratified sample
Cluster sample
Multistage area sample
Simple Random Sampling
Every member of the population has an equal chance of
being selected in the sample.
Simple random sampling
Systematic Sampling
A simple process
Every nth name from the list will be drawn
Systematic sampling
Stratified Sampling
Subsamples are drawn within different strata
Each stratum is more or less equal on some
characteristic
What is the right stratified sample?
Cluster Sampling
Dividing 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.
Cluster sampling
Section 1
Section 2
Section 3
Section 5
Section 4
Examples of Clusters
Population Element
Possible Clusters
Airline travelers
Airports travelers
Planes travelers
Sports fans
Football fans
Basketball fans
Car race fans
Karate fans