Ononot — In a study, a researcher is concerned about 'Non-response Bi

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In a study, a researcher is concerned about 'Non-response Bias'. If $N_{nr}$ is the number of non-respondents and $N$ is the total population, and $\bar{Y}_r$ and $\bar{Y}_{nr}$ are the means of respondents and non-respondents respectively, what is the bias formula?