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UNIT 4: SELECTING A SAMPLE - Coggle Diagram
UNIT 4: SELECTING A SAMPLE
NON-RANDOM / NON-PROBABILITY SAMPLING
purposive sampling
a sampple based on his experience and knowledge of the group to be sampled.
the sampling in qualitatuve research is purposive
quota sampling
used in survey research when it is not possible to list all members of the population
data gatherers are given exact characteristics and quotas of persons to be interviewed
convenience sampling
use volunteers and exist group
answer from volunteer and non volunteer would hit different
RANDOM SAMPLING
cluster sampling
all the members have same traits
most useful
very large population
wide geographic area
randomly select groups, not individuals
feasible method
impossible to obtain a list of all members of the population
often cannot select and assign
systematic sampling
systematic sampling
not used very often
select from a list taking every Kth name
stratified sampling
variable can be divided into various groups
stes similar to random sampling except that selection is from subgroups
identify subgroups
simple random sampling
select a number of participants
sample: individuals, items, or events
whole population: not feasible, not necessary