Standard form or scientific notation is used to write a very large or very small number.
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the sample standard deviation
the sample mean is used to derive the significance level.
They are sometimes used.
It is used to make life easier for mathematicians and scientist. So instead of them having to write 10,000,000 they can just write 10(7). It is also something that everyone can understand. It was invented by Ellie Jane Smith from Germany in 1867.
Better for what? Standard deviation is used for some calculatoins, variance for others.