Ononot — A researcher uses a regression estimator \hat{Y}{lr} = N[\ba

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Data Collectionhard

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A researcher uses a regression estimator $\hat{Y}_{lr} = N[\bar{y} + b(\bar{X} - \bar{x})]$ to estimate a population total. Under what condition is this estimator more efficient than the simple expansion estimator $\hat{Y} = N\bar{y}$ ?