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Data Collectionhard
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In a survey study, non-response bias is calculated as B=NnrN(Yˉr−Yˉnr)B = \frac{N_{nr}}{N} (\bar{Y}_r - \bar{Y}_{nr})B=NNnr​​(Yˉr​−Yˉnr​). What factors minimize this bias?