STA 215 ch 1
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sample taken for convince of sampler, usually not representative of the population
Unbias Sampling Method
does not systemitaclly favor responses in sample that are different in the population
- If a group is over or under represented
- (asking if you believe in God to churchgoers)
people provide incorrect info because do not understand the question
(leading, confusing, non-informative)
piolet survey to ensure the questions make sense
if people likely to respond have different response patterns than people not likely to respond
"different than the unknown truth"
-NOT a mistake
-its unavoidable so needs to be described and quantified
- sampling bias (convenience sample)
- response bias (question confusing,leading, non-informative)
- nonresponse bias
can be prevented
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