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Question: 10 which of the following unbiased estimators for the mean...

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10. Which of the following unbiased estimators for the mean v, is the most robust estimator regardless of the distribution being sampled? O a. the median. X O b, the mean, X oc. the 10% trimmed mean. o d the average ofthe two extreme observations, X. Assume the distribution of employees accumulated sick leave at a large corporation is normally distributed with an unknown standard deviation o. If a sample of 120 employees has a sample mean 182 and a sample standard deviation 12.5 what is the estimated standard error of R? O a. or 1.30 O lb. or 1.14 O or 12.5 O 1.52 12. Suppose the following is a sample of the sell back prices for five used mathematics textbooks at a local college. If the population distribution is continuous and symmetric, which of the following is a point estimate for the mean value of used textbooks? Data: 15, 12, 22, 11, 18. O a. 78 O b. 15.6 O d. 2.01
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