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QUESTION:
X¯¯¯ is said to be an unbiased estimator for μ in the long run except for in which of the following cases? Select the best answer.
ANSWER:
Great job! This is correct. The sample mean and the sample proportion are truly unbiased estimates only when the sample is random and the design is not flawed. If the sample is not random or the design is flawed then the sample mean or proportion could be biased.
