Which of the following statistics are unbiased estimators of population parameters?
choose the correct answer below. select all that apply.
o a. sample standard deviation used to estimate a population standard deviation.
b. sample mean used to estimate a population mean.
i c. sample range used to estimate a population range.
od. sample median used to estimate a population median.
e. sample variance used to estimate a population variance.
of. sample proportion used to estimate a population proportion.