Develop unbiased estimators for means, both equal and unequal first stage unit, and without replacement. without ignorin

[answerhappygod]

Develop unbiased estimators for means, both equal and unequal
first stage unit, and without replacement. without ignoring the
correction factor. For the unequal first stage unit estimators,
also search the mean estimation and total estimates for the three
estimation methods (biased, consistent biased and unbiased).