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



Just a note

Of course, means which summarise an approximately normal population tend to be normal - even when derived from quite small samples.

In this context, a 'population' is any defined set of values which you sample. A 'sample' is assumed to be a randomly-selected set of observations which, on average, are taken to represent that population. Therefore an 'observation' is any value randomly selected from a pre-defined population.