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Question 1130178: A n A newborn baby has extremely low birth weight (ELBW) if it weighs less than 1000 grams. A study of the health of such children in later years examined a random sample of 219 children. Their mean weight at birth was x¯= 810 grams. This sample mean is an unbiased estimator of the mean weight μ in the population of all ELBW babies. This means that
A. the sample mean x¯ will have a distribution that is close to Normal.
B. the average sample mean x¯, over all possible samples, is equal to μ.
C. the sample mean x¯ is always equal to μ.
D. None of the above.
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! B.
Unbiased estimator means that the mean of every possible sample of a given size will equal the parameter being estimated, or here the true mean.
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