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The results of convenience sampling may be very good in some cases and highly biased -LRB- favor certain outcomes -RRB- in others . Sampling data should be done very carefully . Collecting data carelessly can have devastating results . Surveys mailed to households and then returned may be very biased -LRB- they may favor a certain group -RRB- . It is better for the person conducting the survey to select the sample respondents .
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