Problem 4. If an unbiased estimator (for a certain 0 on the whole real line) is sufficient,

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Problem 4. If an unbiased estimator (for a certain 0 on the whole real line) is sufficient, must it achieve the Rao-Cramer lower bound (for some finite sample size)? Explain your reasoning

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Problem 4. If an unbiased estimator (for a certain 0 on the whole real line) is sufficient,

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