It is a measure of the spread of the results around their expected value.
It is a measure of the spread of the results around their expected value.
It is a measure of the spread of the results around their expected value.
It is a measure of the spread of the results around their expected value.
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Collecting the data might be a good start.
The mean is 12 and each observation is 8 units away from 12.
They are sometimes used.
The standard deviation is the standard deviation! Its calculation requires no assumption.