Ononot — In a survey with a non-response rate, the population mean \b

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In a survey with a non-response rate, the population mean $\bar{Y}$ can be decomposed as $\bar{Y} = W_r\bar{Y}_r + W_{nr}\bar{Y}_{nr}$ , where $r$ denotes respondents and $nr$ non-respondents. If a researcher assumes $\bar{Y}_{nr} = \bar{Y}_r$ , what is the bias in the estimate?