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Suppose K K and K3 are three independent and unbiased estimators of Their variances are...

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Suppose K K and K3 are three independent and unbiased estimators of Their variances are in the ratio of 6 8 2 Z and Z3 are three other estimators of such that Which among Z Z and Z3 are unbiased estimators of OA Z Z and Z3 are all biased OB Z and Z3 are unbiased but Z is biased OC Z and Z3 are unbiased but Z is biased OD Z Z and Z3 are all unbiased Which among Z Z and Z3 would be the best estimator for OA Sufficient information is not provided to determine which estimator would be the best OB Z should be chosen since it is both unbiased and has the least variance OC Z should be chosen since it is both unbiased and consistent bo obogen since they are unbiased and have the least variances Z Z Z3 3K K K3 5 K 3K K3 5 K K 3K3 5

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