If the system you are trying to analyze is not very simple and small, you
will find that it is impossible to collect all the data, so you need to take a
sample
Sample is: a subsection of a whole that can be representative of that
whole the best way possible; so that you don't need to collect the whole data
pool
How to select a sample, and how much sample you need to get, etc….. this
is a whole other realm of science labelled "Statistics",
"Sampling", "Data warehousing"
One last thing, "Confidence Level" is the certainty of how
accurately the sample represents the whole system … and "Principle Of
Statistics" let you answer this question and other questions of sampling
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