Which of the following statistics are unbiased estimators of population? parameters? Choose the correct answer below

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Which of the following statistics are unbiased estimators of population? parameters?

Choose the correct answer below. Select all that apply.

A.

Sample median used to estimate a population median.

B.

Sample variance used to estimate a population variance.

C.

Sample proportion used to estimate a population proportion.

D.

Sample mean used to estimate a population mean.

E.

Sample range used to estimate a population range.

F.

Sample standard deviation used to estimate a population standard deviation