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Some Important Concepts
Effects of Errors…
Random sampling errors and systematic errors associated
with the sampling process may combine to yield a sample
that is less than perfectly representative of the
population.
Sampling frame errors eliminate some potential respondents
Random sampling error (due exclusively to random, chance
fluctuation) may cause an imbalance in the representativeness
of the group
Additional errors (if individuals refuse to be contacted/
Interviewed/ or cannot be contacted - nonresponse error
may cause the sample to be less than perfectly represented
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