Suppose you have n observations in your survey. Add all the observations together, to give Sx.
Next square all the observations and add then together and subtract (Sx)2/n.
Divide this number by (n-1) and take the square root.
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You're an idiot. It's standard deviation. Google that for your answer.
You cannot because the median of a distribution is not related to its standard deviation.
Sure it can. But in the survey business, the trick is to select your sample carefully so that they'll be equal, i.e. a sample that is accurately representative of the population.
The standard deviation of the population. the standard deviation of the population.
The standard deviation is 0.