1.5 the sources of bias in sampling

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7 Terms

1
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bias
when the results of a sample are not representative of the population
2
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non response bias
occurs when individuals selected to be in the sample do not respond, do not wish to respond or are unable to be reached
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response bias
exists when the answers on the survey do not reflect the respondents true feelings
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sampling bias
occurs when there is under coverage
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undersampling
the portion of one segment of the population is lower in the sample than it is in the population
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sampling error
results from using a sample to estimate information about a population
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non sampling error
nonresponse and response error, data entry errors and under coverage