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If the sample statistic Xˉ\bar{X}Xˉ is an unbiased estimator of the parameter μ\muμ, then
E(μ−Xˉ)=0E(\mu - \bar{X}) = 0E(μ−Xˉ)=0
E(μ+Xˉ)=0E(\mu + \bar{X}) = 0E(μ+Xˉ)=0
E(μ−Xˉ)2=0E(\mu - \bar{X})^2 = 0E(μ−Xˉ)2=0
E(μ+Xˉ)2=0E(\mu + \bar{X})^2 = 0E(μ+Xˉ)2=0
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