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"It has long been an axiom of mine that the little things are infinitely the most important" 

Just a note Even when its assumptions are fully met, where the sample size is small, this statistic provides a (statistically) biased estimate of population size.
To allow for this Bailey published a less biased estimator in 1951, namely: along with a formula to estimate its random variation. Unfortunately, the error resulting from failure to meet the assumptions of the model is usually much greater than any bias resulting from a small sample size.
